485BPOS

Filed with the U.S. Securities and Exchange Commission on February 13, 2019

1933 Act Registration File No.   033-12213

1940 Act File No. 811-05037

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933		[	X	]
Pre-Effective Amendment No.		[		]
Post-Effective Amendment No.	756	[	X	]

and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940		[	X		]
Amendment No.	757	[		X	]

(Check appropriate box or boxes)

PROFESSIONALLY MANAGED PORTFOLIOS

(Exact Name of Registrant as Specified in Charter)

615 East Michigan Street

Milwaukee, WI  53202

(Address of Principal Executive Offices, including Zip Code)

Registrant’s Telephone Number, including Area Code: (626) 914-7363

Elaine E. Richards, Esq.

Professionally Managed Portfolios

2020 E. Financial Way, Ste. 100

Glendora, CA 91741

(Name and Address of Agent for Service)

Copy to:

Domenick Pugliese, Esq.

Schiff Hardin LLP

666 Fifth Avenue, Suite 1700

New York, NY 10103

It is proposed that this filing will become effective (check appropriate box)

[	X	]	immediately upon filing pursuant to paragraph (b)
[		]	On (date) pursuant to paragraph (b)
[		]	60 days after filing pursuant to paragraph (a)(1)
[		]	on (date) pursuant to paragraph (a)(1)
[		]	75 days after filing pursuant to paragraph (a)(2)
[		]	on (date) pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

[ ] This post-effective amendment designates a new effective date for a previously filed post- effective amendment.

Explanatory Note: This Post-Effective Amendment (“PEA”) No. 756 to the Registration Statement of Professionally Managed Portfolios (the “Trust”) on Form N-1A hereby incorporates Parts A, B and C from the Trust’s PEA No. 753 on Form N‑1A filed on January 28, 2019.  This PEA No. 756 is filed for the sole purpose of submitting the XBRL exhibit for the risk/return summary first provided in PEA No. 753 to the Trust’s Registration Statement.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all of the requirements for effectiveness of this registration statement under Rule 485(b) under the Securities Act and has duly caused this Post-Effective Amendment No. 756 to its Registration Statement on Form N-1A to be signed below on its behalf by the undersigned, duly authorized, in the City of Glendora and State of California on February 13, 2019.

Professionally Managed Portfolios

By:

      Elaine E. Richards

      President

 Pursuant to the requirements of the Securities Act of 1933, as amended, this Post-Effective Amendment No. 756 to its Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.

Signature	Title	Date
Kathleen T. Barr*	Trustee	February 13, 2019
Kathleen T. Barr
Dorothy A. Berry*	Trustee	February 13, 2019
Dorothy A. Berry
Wallace L. Cook*	Trustee	February 13, 2019
Wallace L. Cook
Eric W. Falkeis*	Trustee	February 13, 2019
Eric W. Falkeis
Carl A. Froebel*	Trustee	February 13, 2019
Carl A. Froebel
Steven J. Paggioli*	Trustee	February 13, 2019
Steven J. Paggioli
	President and Principal	February 13, 2019
Elaine E. Richards	Executive Officer
/s/ Aaron J. Perkovich*	Vice President, Treasurer and Principal Financial and	February 13, 2019
Aaron J. Perkovich	Accounting Officer
*By:		February 13, 2019
Elaine E. Richards, Attorney-In Fact  pursuant  to Power of Attorney

INDEX TO EXHIBITS

Exhibit	Exhibit No.
Instance Document	EX-101.INS
Schema Document	EX-101.SCH
Calculation Linkbase Document	EX-101.CAL
Definition Linkbase Document	EX-101.DEF
Label Linkbase Document	EX-101.LAB
Presentation Linkbase Document	EX-101.PRE

XML

Document and Entity Information	Total
Prospectus:
Document Type	485BPOS
Document Period End Date	Sep. 30, 2018
Registrant Name	PROFESSIONALLY MANAGED PORTFOLIOS
Central Index Key	0000811030
Amendment Flag	false
Document Creation Date	Jan. 28, 2019
Document Effective Date	Jan. 28, 2019
Prospectus Date	Jan. 30, 2019
Boston Common ESG Impact International Fund | Boston Common ESG Impact International
Prospectus:
Trading Symbol	BCAIX
Boston Common ESG Impact U.S. Equity Fund | Boston Common ESG Impact U.S. Equity
Prospectus:
Trading Symbol	BCAMX

XML

Boston Common ESG Impact International Fund

Boston Common ESG Impact International Fund

Investment Objective

The Boston Common ESG Impact International Fund (the “International Fund”) seeks long-term capital appreciation.

Fees and Expenses of the International Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the International Fund.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees	Boston Common ESG Impact International Fund Boston Common ESG Impact International
Redemption Fee (as a percentage of amount redeemed within 30 days of purchase)	2.00%

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses	Boston Common ESG Impact International Fund Boston Common ESG Impact International
Management Fees	0.80%
Distribution and Service (12b-1) Fees	none
Other Expenses	0.24%
Total Annual Fund Operating Expenses	1.04%

Example

This Example is intended to help you compare the cost of investing in the International Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the International Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the International Fund’s operating expenses remain the same.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example	1 Year	3 Years	5 Years	10 Years
Boston Common ESG Impact International Fund | Boston Common ESG Impact International | USD ($)	106	331	574	1,271

Portfolio Turnover

The International Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when International Fund shares are held in a taxable account.  These costs, which are not reflected in annual fund operating expenses or in the above example, affect the International Fund’s performance.  During the most recent fiscal year ended September 30, 2018, the International Fund’s portfolio turnover rate was 26% of the average value of its portfolio.

Principal Investment Strategies

Boston Common Asset Management, LLC (“Boston Common” or the “Adviser”) seeks to preserve and build capital over the long term through investing in a diversified portfolio of common stocks and American Depositary Receipts (“ADRs”) of companies we believe are high quality (lower debt/total capital, earnings stability and stable cash flow), sustainable and undervalued.  We seek companies with sound governance and histories of responsible financial management that we believe are capable of consistent, visible profitability over a long time horizon.  We look for indicators of quality in firms if they are experiencing superior growth and operating successfully in their respective economic sectors.  We measure a firm’s growth by comparing its products or services or improving competitive conditions among its peers.  We then determine whether any of the individual firms appear to be trading at discounts to their intrinsic value.  Here our research-driven conviction is enhanced by our 360-degree perspective where we integrate financial and environmental, social, and governance (“ESG”) criteria into the stock selection process.  We believe markets typically misvalue the risks and opportunities presented by ESG factors, both in terms of the timing and the magnitude of outcomes.  We believe shareowner engagement plays a critically important role in raising the sustainability profile of our portfolios and empowers company management to be long-term in its focus.

Boston Common’s ESG research process integrates information from disparate sources to form a holistic understanding of corporate performance.  We may incorporate information from one or more third party ESG research providers, news sources, non-governmental organizations, and company and industry contacts.  We endeavor to integrate financial and sustainability factors into our investment process because we believe ESG research helps us identify companies that will be successful over the long-term.  We evaluate companies on (E)nvironmental issues, looking for organizations that demonstrate a higher level of environmental responsibility than their peers and understand that natural resources are limited.  We favor companies that conserve natural resources, reduce volume and toxicity of waste generated, and manage direct and indirect greenhouse gas emissions.  We assess a company’s commitment to (S)ocial standards including human rights, animal welfare, workplace health and safety, and fair treatment of employees globally.  We appraise companies’ adherence to best practices in (G)overnance, including policies favoring transparency and accountability to shareholders, and a commitment to diversity.  As a result, we believe ESG research helps improve portfolio quality and financial return potential.

Boston Common selects stocks through bottom-up, fundamental research, while maintaining a disciplined approach to valuation and risk control. We may sell a security when its price reaches a set target if we believe that other investments are more attractive, or for other reasons we may determine.

We use our voice as a shareowner to raise environmental, social, and governance issues with the management of select portfolio companies through a variety of channels.  These may include engaging in dialogue with management, participating in shareholder proposal filings, voting proxies in accordance with our proxy voting guidelines, and participating in the annual shareholder meeting process.  Through this effort, we seek to encourage a company’s management toward greater transparency, accountability, disclosure and commitment to ESG issues.

The International Fund will normally invest at least 80% of its net assets, plus borrowings for investment purposes, in the securities of non‑U.S. companies that meet the Adviser’s ESG criteria.  The International Fund may invest in preferred stocks as well as in securities that are convertible into common stocks.  The International Fund may also invest in European Depositary Receipts (“EDRs”) and Global Depositary Receipts (“GDRs”).  Up to 10% of the International Fund’s total assets may be invested in securities of companies located in emerging markets.  The International Fund generally seeks to invest in companies that have market capitalizations of $2 billion or greater.

Principal Investment Risks

There is the risk that you could lose all or a portion of your investment in the International Fund.  The following riskscould affect the value of your investmentin the International Fund:

· Market and Regulatory Risk:  Events in the financial markets and economy may cause volatility and uncertainty and adversely impact the Fund’s performance. Market events may affect a single issuer, industry, sector, or the market as a whole. Traditionally liquid investments may experience periods of diminished liquidity. Governmental and regulatory actions, including tax law changes, may also impair portfolio management and have unexpected or adverse consequences on particular markets, strategies, or investments. Equity Risk:  Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value. These fluctuations may cause a security to be worth less than its cost when originally purchased or less than it was worth at an earlier time.

· Equity Risk:  Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value. These fluctuations may cause a security to be worth less than its cost when originally purchaed or less than it was worth at an earlier time.

· Management Risk:  Boston Common may fail to implement the International Fund’s investment strategies or meet its investment objective.

· Foreign Securities and Emerging Markets Risk:  Foreign securities are typically subject to increased risks as compared to U.S. securities, and include risks associated with: (1) internal and external political and economic developments – e.g., the political, economic and social policies and structures of some foreign countries may be less stable and more volatile than those in the United States or some foreign countries may be subject to trading restrictions; (2) trading practices – e.g., government supervision and regulation of foreign securities and currency markets, trading systems and brokers may be less than in the United States; (3) availability of information – e.g., foreign issuers may not be subject to the same disclosure, accounting and financial reporting standards as U.S. issuers, (4) greater volatility; and (5) currency fluctuations.  These risks may be greater in emerging market countries.

· Depositary Receipt Risk:  Depositary receipts are subject to many of the risks associated with investing directly in foreign securities, including, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. In addition, holders of depositary receipts may have limited voting rights, may not have the same rights afforded to stockholders of a typical company in the event of a corporate action, such as an acquisition, merger or rights offering, and may experience difficulty in receiving company stockholder communications. There is no guarantee that a financial institution will continue to sponsor a depositary receipt, or that the depositary receipts will continue to trade on an exchange, either of which could adversely affect the liquidity, availability and pricing of the depositary receipt. Changes in foreign currency exchange rates will affect the value of depositary receipts and, therefore, may affect the value of your investment in the Fund.

· Large Companies Risk:  Larger, more established companies may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors.  Also, large-cap companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.

· Sustainability (ESG) Policy Risk:  The International Fund’s ESG policy could cause the International Fund to perform differently compared to similar funds that do not have such a policy.  This ESG policy may result in the International Fund foregoing opportunities to buy certain securities when it might otherwise be advantageous to do so, or selling securities for ESG reasons when it might be otherwise disadvantageous for it to do so.  The International Fund will vote proxies in a manner which is consistent with its ESG criteria, which may not always be consistent with maximizing short-term performance of the issuer.

· Regional Risk:  Since the International Fund may invest a significant portion of its assets in companies in a specific region, including Europe, the International Fund is subject to greater risks of adverse developments in that region than a fund that is more broadly diversified geographically.  Current political uncertainty surrounding the European Union (“EU”) and its membership, including the 2016 referendum in which the United Kingdom voted to exit the EU, may increase market volatility. The financial instability of some countries in the EU, including Greece, Italy and Spain, together with the risk of that impacting other more stable countries may increase the economic risk of investing in companies in Europe.

Performance

The following performance information provides some indication of the risks of investing in the International Fund.  The bar chart below illustrates how the International Fund’s total returns have varied from year‑to‑year.  The table below illustrates how the International Fund’s average annual total returns for the 1-year, 5-year and since-inception periods compare with that of a broad-based securities index.  This comparison is provided to offer a broader market perspective.  The International Fund’s past performance, before and after taxes, is not necessarily an indication of how the International Fund will perform in the future and does not guarantee future results.  Updated performance information is available on the International Fund’s website at www.bostoncommonfunds.com.

Calendar Year Total Return As of December 31,

Highest Quarterly Return:	Q1, 2012	11.99%
Lowest Quarterly Return:	Q3, 2011	-19.11%

Average Annual Total Return as of December 31, 2018

Average Annual Returns - Boston Common ESG Impact International Fund	Label	Average Annual Returns, 1 Year	Average Annual Returns, 5 Years	Average Annual Returns, Since Inception	Average Annual Returns, Inception Date
Boston Common ESG Impact International	Return Before Taxes	(13.45%)	(0.26%)	2.15%	Dec. 29, 2010
After Taxes on Distributions | Boston Common ESG Impact International	Return After Taxes on Distributions	(13.57%)	(0.51%)	1.93%
After Taxes on Distributions and Sale of Fund Shares | Boston Common ESG Impact International	Return After Taxes on Distributions and Sale of Fund Shares	(7.59%)	(0.04%)	1.81%
MSCI EAFE Index (reflects no deduction for fees, expenses or taxes)	MSCI EAFE Index (reflects no deduction for fees, expenses or taxes)	(13.79%)	0.53%	3.36%	Dec. 29, 2010

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and does not reflect the impact of state and local taxes.  Actual after-tax returns depend on the individual investor’s situation and may differ from those shown.  Furthermore, the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”).

In certain cases, Return After Taxes on Distribution and Sale of Fund Shares may be higher than the other return figures for the same period. This will occur when a capital loss is realized upon the sale of International Fund shares or provides an assumed tax benefit that increases the return. Your actual after-tax returns depend on your tax situation and may differ from these shown.

XML

Label

Element

Value

Boston Common ESG Impact International Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Boston Common ESG Impact International Fund

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Boston Common ESG Impact International Fund (the “International Fund”) seeks long-term capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the International Fund

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the International Fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The International Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when International Fund shares are held in a taxable account.  These costs, which are not reflected in annual fund operating expenses or in the above example, affect the International Fund’s performance.  During the most recent fiscal year ended September 30, 2018, the International Fund’s portfolio turnover rate was 26% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

26.00%

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the International Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the International Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the International Fund’s operating expenses remain the same.

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Boston Common Asset Management, LLC (“Boston Common” or the “Adviser”) seeks to preserve and build capital over the long term through investing in a diversified portfolio of common stocks and American Depositary Receipts (“ADRs”) of companies we believe are high quality (lower debt/total capital, earnings stability and stable cash flow), sustainable and undervalued.  We seek companies with sound governance and histories of responsible financial management that we believe are capable of consistent, visible profitability over a long time horizon.  We look for indicators of quality in firms if they are experiencing superior growth and operating successfully in their respective economic sectors.  We measure a firm’s growth by comparing its products or services or improving competitive conditions among its peers.  We then determine whether any of the individual firms appear to be trading at discounts to their intrinsic value.  Here our research-driven conviction is enhanced by our 360-degree perspective where we integrate financial and environmental, social, and governance (“ESG”) criteria into the stock selection process.  We believe markets typically misvalue the risks and opportunities presented by ESG factors, both in terms of the timing and the magnitude of outcomes.  We believe shareowner engagement plays a critically important role in raising the sustainability profile of our portfolios and empowers company management to be long-term in its focus.

Boston Common’s ESG research process integrates information from disparate sources to form a holistic understanding of corporate performance.  We may incorporate information from one or more third party ESG research providers, news sources, non-governmental organizations, and company and industry contacts.  We endeavor to integrate financial and sustainability factors into our investment process because we believe ESG research helps us identify companies that will be successful over the long-term.  We evaluate companies on (E)nvironmental issues, looking for organizations that demonstrate a higher level of environmental responsibility than their peers and understand that natural resources are limited.  We favor companies that conserve natural resources, reduce volume and toxicity of waste generated, and manage direct and indirect greenhouse gas emissions.  We assess a company’s commitment to (S)ocial standards including human rights, animal welfare, workplace health and safety, and fair treatment of employees globally.  We appraise companies’ adherence to best practices in (G)overnance, including policies favoring transparency and accountability to shareholders, and a commitment to diversity.  As a result, we believe ESG research helps improve portfolio quality and financial return potential.

Boston Common selects stocks through bottom-up, fundamental research, while maintaining a disciplined approach to valuation and risk control. We may sell a security when its price reaches a set target if we believe that other investments are more attractive, or for other reasons we may determine.

We use our voice as a shareowner to raise environmental, social, and governance issues with the management of select portfolio companies through a variety of channels.  These may include engaging in dialogue with management, participating in shareholder proposal filings, voting proxies in accordance with our proxy voting guidelines, and participating in the annual shareholder meeting process.  Through this effort, we seek to encourage a company’s management toward greater transparency, accountability, disclosure and commitment to ESG issues.

The International Fund will normally invest at least 80% of its net assets, plus borrowings for investment purposes, in the securities of non‑U.S. companies that meet the Adviser’s ESG criteria.  The International Fund may invest in preferred stocks as well as in securities that are convertible into common stocks.  The International Fund may also invest in European Depositary Receipts (“EDRs”) and Global Depositary Receipts (“GDRs”).  Up to 10% of the International Fund’s total assets may be invested in securities of companies located in emerging markets.  The International Fund generally seeks to invest in companies that have market capitalizations of $2 billion or greater.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

There is the risk that you could lose all or a portion of your investment in the International Fund.  The following riskscould affect the value of your investmentin the International Fund:

· Market and Regulatory Risk:  Events in the financial markets and economy may cause volatility and uncertainty and adversely impact the Fund’s performance. Market events may affect a single issuer, industry, sector, or the market as a whole. Traditionally liquid investments may experience periods of diminished liquidity. Governmental and regulatory actions, including tax law changes, may also impair portfolio management and have unexpected or adverse consequences on particular markets, strategies, or investments. Equity Risk:  Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value. These fluctuations may cause a security to be worth less than its cost when originally purchased or less than it was worth at an earlier time.

· Equity Risk:  Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value. These fluctuations may cause a security to be worth less than its cost when originally purchaed or less than it was worth at an earlier time.

· Management Risk:  Boston Common may fail to implement the International Fund’s investment strategies or meet its investment objective.

· Foreign Securities and Emerging Markets Risk:  Foreign securities are typically subject to increased risks as compared to U.S. securities, and include risks associated with: (1) internal and external political and economic developments – e.g., the political, economic and social policies and structures of some foreign countries may be less stable and more volatile than those in the United States or some foreign countries may be subject to trading restrictions; (2) trading practices – e.g., government supervision and regulation of foreign securities and currency markets, trading systems and brokers may be less than in the United States; (3) availability of information – e.g., foreign issuers may not be subject to the same disclosure, accounting and financial reporting standards as U.S. issuers, (4) greater volatility; and (5) currency fluctuations.  These risks may be greater in emerging market countries.

· Depositary Receipt Risk:  Depositary receipts are subject to many of the risks associated with investing directly in foreign securities, including, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. In addition, holders of depositary receipts may have limited voting rights, may not have the same rights afforded to stockholders of a typical company in the event of a corporate action, such as an acquisition, merger or rights offering, and may experience difficulty in receiving company stockholder communications. There is no guarantee that a financial institution will continue to sponsor a depositary receipt, or that the depositary receipts will continue to trade on an exchange, either of which could adversely affect the liquidity, availability and pricing of the depositary receipt. Changes in foreign currency exchange rates will affect the value of depositary receipts and, therefore, may affect the value of your investment in the Fund.

· Large Companies Risk:  Larger, more established companies may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors.  Also, large-cap companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.

· Sustainability (ESG) Policy Risk:  The International Fund’s ESG policy could cause the International Fund to perform differently compared to similar funds that do not have such a policy.  This ESG policy may result in the International Fund foregoing opportunities to buy certain securities when it might otherwise be advantageous to do so, or selling securities for ESG reasons when it might be otherwise disadvantageous for it to do so.  The International Fund will vote proxies in a manner which is consistent with its ESG criteria, which may not always be consistent with maximizing short-term performance of the issuer.

· Regional Risk:  Since the International Fund may invest a significant portion of its assets in companies in a specific region, including Europe, the International Fund is subject to greater risks of adverse developments in that region than a fund that is more broadly diversified geographically.  Current political uncertainty surrounding the European Union (“EU”) and its membership, including the 2016 referendum in which the United Kingdom voted to exit the EU, may increase market volatility. The financial instability of some countries in the EU, including Greece, Italy and Spain, together with the risk of that impacting other more stable countries may increase the economic risk of investing in companies in Europe.

Risk Lose Money [Text]

rr_RiskLoseMoney

There is the risk that you could lose all or a portion of your investment in the International Fund.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following performance information provides some indication of the risks of investing in the International Fund.  The bar chart below illustrates how the International Fund’s total returns have varied from year‑to‑year.  The table below illustrates how the International Fund’s average annual total returns for the 1-year, 5-year and since-inception periods compare with that of a broad-based securities index.  This comparison is provided to offer a broader market perspective.  The International Fund’s past performance, before and after taxes, is not necessarily an indication of how the International Fund will perform in the future and does not guarantee future results.  Updated performance information is available on the International Fund’s website at www.bostoncommonfunds.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following performance information provides some indication of the risks of investing in the International Fund.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.bostoncommonfunds.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

The International Fund’s past performance, before and after taxes, is not necessarily an indication of how the International Fund will perform in the future and does not guarantee future results.

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Return As of December 31,

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Quarterly Return:	Q1, 2012	11.99%
Lowest Quarterly Return:	Q3, 2011	-19.11%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarterly Return:

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2012

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

11.99%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Return:

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(19.11%)

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

(reflects no deduction for fees, expenses or taxes)

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and does not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

Actual after-tax returns depend on the individual investor’s situation and may differ from those shown. Furthermore, the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”).

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

In certain cases, Return After Taxes on Distribution and Sale of Fund Shares may be higher than the other return figures for the same period. This will occur when a capital loss is realized upon the sale of International Fund shares or provides an assumed tax benefit that increases the return. Your actual after-tax returns depend on your tax situation and may differ from these shown.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and does not reflect the impact of state and local taxes.  Actual after-tax returns depend on the individual investor’s situation and may differ from those shown.  Furthermore, the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”).

In certain cases, Return After Taxes on Distribution and Sale of Fund Shares may be higher than the other return figures for the same period. This will occur when a capital loss is realized upon the sale of International Fund shares or provides an assumed tax benefit that increases the return. Your actual after-tax returns depend on your tax situation and may differ from these shown.

Caption

rr_AverageAnnualReturnCaption

Average Annual Total Return as of December 31, 2018

Boston Common ESG Impact International Fund | MSCI EAFE Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

Label

rr_AverageAnnualReturnLabel

MSCI EAFE Index (reflects no deduction for fees, expenses or taxes)

Average Annual Returns, 1 Year

rr_AverageAnnualReturnYear01

(13.79%)

Average Annual Returns, 5 Years

rr_AverageAnnualReturnYear05

0.53%

Average Annual Returns, Since Inception

rr_AverageAnnualReturnSinceInception

3.36%

Average Annual Returns, Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 29, 2010

Boston Common ESG Impact International Fund | Boston Common ESG Impact International

Risk/Return:

rr_RiskReturnAbstract

Redemption Fee (as a percentage of Amount Redeemed)

rr_RedemptionFeeOverRedemption

(2.00%)

Management Fees

rr_ManagementFeesOverAssets

0.80%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.24%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.04%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 106

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

331

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

574

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,271

Annual Return 2011

rr_AnnualReturn2011

(12.89%)

Annual Return 2012

rr_AnnualReturn2012

13.98%

Annual Return 2013

rr_AnnualReturn2013

21.03%

Annual Return 2014

rr_AnnualReturn2014

(7.08%)

Annual Return 2015

rr_AnnualReturn2015

(1.97%)

Annual Return 2016

rr_AnnualReturn2016

(0.96%)

Annual Return 2017

rr_AnnualReturn2017

26.39%

Annual Return 2018

rr_AnnualReturn2018

(13.45%)

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Average Annual Returns, 1 Year

rr_AverageAnnualReturnYear01

(13.45%)

Average Annual Returns, 5 Years

rr_AverageAnnualReturnYear05

(0.26%)

Average Annual Returns, Since Inception

rr_AverageAnnualReturnSinceInception

2.15%

Average Annual Returns, Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 29, 2010

Boston Common ESG Impact International Fund | Boston Common ESG Impact International | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Average Annual Returns, 1 Year

rr_AverageAnnualReturnYear01

(13.57%)

Average Annual Returns, 5 Years

rr_AverageAnnualReturnYear05

(0.51%)

Average Annual Returns, Since Inception

rr_AverageAnnualReturnSinceInception

1.93%

Boston Common ESG Impact International Fund | Boston Common ESG Impact International | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Average Annual Returns, 1 Year

rr_AverageAnnualReturnYear01

(7.59%)

Average Annual Returns, 5 Years

rr_AverageAnnualReturnYear05

(0.04%)

Average Annual Returns, Since Inception

rr_AverageAnnualReturnSinceInception

1.81%

XML

Boston Common ESG Impact U.S. Equity Fund

Boston Common ESG Impact U.S. Equity Fund

Investment Objective

The Boston Common ESG Impact U.S. Equity Fund (the “U.S. Equity Fund”) seeks long-term capital appreciation.

Fees and Expenses of the U.S. Equity Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the U.S. Equity Fund.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees	Boston Common ESG Impact U.S. Equity Fund Boston Common ESG Impact U.S. Equity
Redemption Fee (as a percentage of amount redeemed within 30 days of purchase)	2.00%

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses	Boston Common ESG Impact U.S. Equity Fund Boston Common ESG Impact U.S. Equity
Management Fees	0.75%
Distribution and Service (12b-1) Fees	none
Other Expenses	0.55%
Total Annual Fund Operating Expenses	1.30%
Fee Reduction and/or Expense Reimbursement	(0.30%)
Total Annual Fund Operating Expenses After Fee Reduction and/or Expense Reimbursement	1.00%	[1]

Example

This Example is intended to help you compare the cost of investing in the U.S. Equity Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the U.S. Equity Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the U.S. Equity Fund’s operating expenses remain the same (taking into account the contractual Expense Cap for the first year only).

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example	1 Year	3 Years	5 Years	10 Years
Boston Common ESG Impact U.S. Equity Fund | Boston Common ESG Impact U.S. Equity | USD ($)	102	382	684	1,541

Portfolio Turnover

The U.S. Equity Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account.  These costs, which are not reflected in annual fund operating expenses or in the above example, affect the U.S. Equity Fund’s performance.  During the most recent fiscal year ended September 30, 2018, the U.S. Equity Fund’s portfolio turnover rate was 27% of the average value of its portfolio.

Principal Investment Strategies

Boston Common Asset Management, LLC (“Boston Common” or the “Adviser”) seeks to preserve and build capital over the long term through investing in a diversified portfolio of stocks and American Depositary Receipts (“ADRs”) of companies we believe are high quality (lower debt/total capital, earnings stability and stable cash flow), sustainable and undervalued.  We look for companies with sound governance and a history of responsible financial management that we believe are capable of consistent, visible profitability over a long time horizon.  We look for indicators of quality in firms if they are experiencing superior growth and operating successfully in their respective economic sectors. We measure a firm’s growth by comparing its products or services or improving competitive conditions among its peers.  We then determine whether any of the individual firms appear to be trading at discounts to their intrinsic value.  Here our research-driven conviction is enhanced by our 360-degree perspective where we integrate financial and environmental, social, and governance (“ESG”) criteria into the stock selection process.  We believe markets typically misvalue the risks and opportunities presented by ESG factors, both in terms of the timing and the magnitude of outcomes.  We believe shareowner engagement plays a critically important role in raising the sustainability profile of our portfolios and empowers company management to be long-term in its focus.

Boston Common’s ESG research process integrates information from disparate sources to form a holistic understanding of corporate performance.  We may incorporate information from one or more third party ESG research providers, news sources, non-governmental organizations, and company and industry contacts.  We endeavor to integrate financial and sustainability factors into our investment process because we believe ESG research helps us identify companies that will be successful over the long‑term.  We evaluate companies on (E)nvironmental issues, looking for organizations that demonstrate a higher level of environmental responsibility than their peers and understand that natural resources are limited.  We favor companies that conserve natural resources, reduce volume and toxicity of waste generated, and manage direct and indirect greenhouse gas emissions.  We assess a company’s commitment to (S)ocial standards including human rights, animal welfare, workplace health and safety, and fair treatment of employees globally.  We appraise companies’ adherence to best practices in (G)overnance, including policies favoring transparency and accountability to shareholders, and a commitment to diversity.  As a result, we believe ESG research helps improve portfolio quality and financial return potential.

Boston Common selects stocks through bottom-up, fundamental research, while maintaining a disciplined approach to valuation and risk control.  We may sell a security when its price reaches a set target if we believe that other investments are more attractive, or for other reasons we may determine.

We use our voice as a shareowner to raise environmental, social, and governance issues with the management of select portfolio companies through a variety of channels.  These may include engaging in dialogue with management, participating in shareholder proposal filings, voting proxies in accordance with our proxy voting guidelines, and participating in the annual shareholder meeting process.  Through this effort, we seek to encourage a company’s management towards greater transparency, accountability, disclosure and commitment to ESG issues.

The U.S. Equity Fund will normally invest at least 80% of its net assets, plus borrowings for investment purposes, in equity securities of U.S. companies that meet the Adviser’s ESG criteria.  Equity securities include common and preferred stocks, as well as securities that are convertible into common stocks.  The U.S. Equity Fund may also invest up to 20% of its total assets in ADRs.  The U.S. Equity Fund may also invest in other stable, cash-flow generating companies, including publicly-traded Real Estate Investment Trusts (“REITs”). The U.S. Equity Fund generally seeks to invest in companies that have market capitalizations of $2 billion or greater.

Principal Investment Risks

There is the risk that you could lose all or a portion of your investment in the U.S. Equity Fund.  The following riskscould affect the value of your investmentin the Fund:

· Market and Regulatory Risk:  Events in the financial markets and economy may cause volatility and uncertainty and adversely impact the U.S. Equity Fund’s performance. Market events may affect a single issuer, industry, sector, or the market as a whole. Traditionally liquid investments may experience periods of diminished liquidity. Governmental and regulatory actions, including tax law changes, may also impair portfolio management and have unexpected or adverse consequences on particular markets, strategies, or investments.

·   Equity Risk:  Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value. These fluctuations may cause a security to be worth less than its cost when originally purchased or less than it was worth at an earlier time.

· Management Risk:  Boston Common may fail to implement the Fund’s investment strategies or meet its investment objective.

·   Depositary Receipt Risk:  Depositary receipts are subject to many of the risks associated with investing directly in foreign securities, including, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. In addition, holders of depositary receipts may have limited voting rights, may not have the same rights afforded to stockholders of a typical company in the event of a corporate action, such as an acquisition, merger or rights offering, and may experience difficulty in receiving company stockholder communications. There is no guarantee that a financial institution will continue to sponsor a depositary receipt, or that the depositary receipts will continue to trade on an exchange, either of which could adversely affect the liquidity, availability and pricing of the depositary receipt. Changes in foreign currency exchange rates will affect the value of depositary receipts and, therefore, may affect the value of your investment in the U.S. Equity Fund.

·   Large Companies Risk:  Larger, more established companies may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors.  Also, large-cap companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.

·   Sustainability (ESG) Policy Risk:  The U.S. Equity Fund’s ESG policy could cause it to perform differently compared to similar funds that do not have such a policy.  This ESG policy may result in the U.S. Equity Fund foregoing opportunities to buy certain securities when it might otherwise be advantageous to do so, or selling securities for ESG reasons when it might be otherwise disadvantageous for it to do so.  The U.S. Equity Fund will vote proxies in a manner which is consistent with its ESG criteria, which may not always be consistent with maximizing short-term performance of the issuer.

·   Real Estate Investment Trusts Risk:  REIT prices may fall because of the failure of borrowers to pay their loans and/or poor management. The value of REITs may also be affected by increases in property taxes and changes in tax laws and interest rates.

Performance

The following performance information provides some indication of the risks of investing in the U.S. Equity Fund.  The bar chart below illustrates how the U.S. Equity Fund’s total returns have varied from year‑to‑year.  The table below illustrates how the U.S. Equity Fund’s average annual total returns for the 1-year, 5-year and since-inception periods compare with that of a broad-based securities index.  This comparison is provided to offer a broader market perspective.  The U.S. Equity Fund’s past performance, before and after taxes, is not necessarily an indication of how the U.S. Equity Fund will perform in the future and does not guarantee future results.  Updated performance information is available on the U.S. Equity Fund’s website at www.bostoncommonfunds.com.

Calendar Year Total Return As of December 31,

Highest Quarterly Return:	Q4, 2013	10.42%
Lowest Quarterly Return:	Q4, 2018	-13.56%

Average Annual Total Return as of December 31, 2018

Average Annual Returns - Boston Common ESG Impact U.S. Equity Fund	Label	Average Annual Returns, 1 Year	Average Annual Returns, 5 Years	Average Annual Returns, Since Inception	Average Annual Returns, Inception Date
Boston Common ESG Impact U.S. Equity	Return Before Taxes	(8.45%)	5.70%	8.90%	Apr. 30, 2012
After Taxes on Distributions | Boston Common ESG Impact U.S. Equity	Return After Taxes on Distributions	(9.58%)	5.04%	8.20%
After Taxes on Distributions and Sale of Fund Shares | Boston Common ESG Impact U.S. Equity	Return After Taxes on Distributions and Sale of Fund Shares	(4.20%)	4.44%	7.06%
S&P 500® Index (reflects no deduction for fees, expenses or taxes)	S&P 500® Index (reflects no deduction for fees, expenses or taxes)	(4.38%)	8.49%	11.47%	Apr. 30, 2012

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and does not reflect the impact of state and local taxes.  Actual after-tax returns depend on the individual investor’s situation and may differ from those shown.  Furthermore, the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or IRAs.

In certain cases, Return After Taxes on Distribution and Sale of Fund Shares may be higher than the other return figures for the same period. This will occur when a capital loss is realized upon the sale of Fund shares or provides an assumed tax benefit that increases the return. Your actual after-tax returns depend on your tax situation and may differ from these shown.

[1] The Adviser has contractually agreed to reduce its fees and/or pay U.S. Equity Fund expenses (excluding acquired fund fees and expenses, interest expense in connection with investment activities, taxes and extraordinary expenses) in order to limit Total Annual Fund Operating Expenses After Fee Reduction and/or Expense Reimbursement to 1.00% of the U.S. Equity Fund's average daily net assets (the "Expense Cap"). The Expense Cap is indefinite, but will remain in effect until at least January 31, 2020 and may be terminated at any time by the Trust's Board of Trustees (the "Board") upon 60 days' notice to the Adviser, or by the Adviser with consent of the Board. The Adviser is permitted, with Board approval, to be reimbursed for fee reductions and/or expense payments made in the prior three years. This reimbursement may be requested if the aggregate amount actually paid by the U.S. Equity Fund toward operating expenses for such period (taking into account any reimbursement) does not exceed the lesser of the Expense Cap in place at the time of waiver or at the time of reimbursement.

XML

Label

Element

Value

Boston Common ESG Impact U.S. Equity Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Boston Common ESG Impact U.S. Equity Fund

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Boston Common ESG Impact U.S. Equity Fund (the “U.S. Equity Fund”) seeks long-term capital appreciation.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the U.S. Equity Fund

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the U.S. Equity Fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

Jan. 31, 2020

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The U.S. Equity Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account.  These costs, which are not reflected in annual fund operating expenses or in the above example, affect the U.S. Equity Fund’s performance.  During the most recent fiscal year ended September 30, 2018, the U.S. Equity Fund’s portfolio turnover rate was 27% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

27.00%

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the U.S. Equity Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the U.S. Equity Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the U.S. Equity Fund’s operating expenses remain the same (taking into account the contractual Expense Cap for the first year only).

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Boston Common Asset Management, LLC (“Boston Common” or the “Adviser”) seeks to preserve and build capital over the long term through investing in a diversified portfolio of stocks and American Depositary Receipts (“ADRs”) of companies we believe are high quality (lower debt/total capital, earnings stability and stable cash flow), sustainable and undervalued.  We look for companies with sound governance and a history of responsible financial management that we believe are capable of consistent, visible profitability over a long time horizon.  We look for indicators of quality in firms if they are experiencing superior growth and operating successfully in their respective economic sectors. We measure a firm’s growth by comparing its products or services or improving competitive conditions among its peers.  We then determine whether any of the individual firms appear to be trading at discounts to their intrinsic value.  Here our research-driven conviction is enhanced by our 360-degree perspective where we integrate financial and environmental, social, and governance (“ESG”) criteria into the stock selection process.  We believe markets typically misvalue the risks and opportunities presented by ESG factors, both in terms of the timing and the magnitude of outcomes.  We believe shareowner engagement plays a critically important role in raising the sustainability profile of our portfolios and empowers company management to be long-term in its focus.

Boston Common’s ESG research process integrates information from disparate sources to form a holistic understanding of corporate performance.  We may incorporate information from one or more third party ESG research providers, news sources, non-governmental organizations, and company and industry contacts.  We endeavor to integrate financial and sustainability factors into our investment process because we believe ESG research helps us identify companies that will be successful over the long‑term.  We evaluate companies on (E)nvironmental issues, looking for organizations that demonstrate a higher level of environmental responsibility than their peers and understand that natural resources are limited.  We favor companies that conserve natural resources, reduce volume and toxicity of waste generated, and manage direct and indirect greenhouse gas emissions.  We assess a company’s commitment to (S)ocial standards including human rights, animal welfare, workplace health and safety, and fair treatment of employees globally.  We appraise companies’ adherence to best practices in (G)overnance, including policies favoring transparency and accountability to shareholders, and a commitment to diversity.  As a result, we believe ESG research helps improve portfolio quality and financial return potential.

Boston Common selects stocks through bottom-up, fundamental research, while maintaining a disciplined approach to valuation and risk control.  We may sell a security when its price reaches a set target if we believe that other investments are more attractive, or for other reasons we may determine.

We use our voice as a shareowner to raise environmental, social, and governance issues with the management of select portfolio companies through a variety of channels.  These may include engaging in dialogue with management, participating in shareholder proposal filings, voting proxies in accordance with our proxy voting guidelines, and participating in the annual shareholder meeting process.  Through this effort, we seek to encourage a company’s management towards greater transparency, accountability, disclosure and commitment to ESG issues.

The U.S. Equity Fund will normally invest at least 80% of its net assets, plus borrowings for investment purposes, in equity securities of U.S. companies that meet the Adviser’s ESG criteria.  Equity securities include common and preferred stocks, as well as securities that are convertible into common stocks.  The U.S. Equity Fund may also invest up to 20% of its total assets in ADRs.  The U.S. Equity Fund may also invest in other stable, cash-flow generating companies, including publicly-traded Real Estate Investment Trusts (“REITs”). The U.S. Equity Fund generally seeks to invest in companies that have market capitalizations of $2 billion or greater.

Risk [Heading]

rr_RiskHeading

Principal Investment Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

There is the risk that you could lose all or a portion of your investment in the U.S. Equity Fund.  The following riskscould affect the value of your investmentin the Fund:

· Market and Regulatory Risk:  Events in the financial markets and economy may cause volatility and uncertainty and adversely impact the U.S. Equity Fund’s performance. Market events may affect a single issuer, industry, sector, or the market as a whole. Traditionally liquid investments may experience periods of diminished liquidity. Governmental and regulatory actions, including tax law changes, may also impair portfolio management and have unexpected or adverse consequences on particular markets, strategies, or investments.

·   Equity Risk:  Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value. These fluctuations may cause a security to be worth less than its cost when originally purchased or less than it was worth at an earlier time.

· Management Risk:  Boston Common may fail to implement the Fund’s investment strategies or meet its investment objective.

·   Depositary Receipt Risk:  Depositary receipts are subject to many of the risks associated with investing directly in foreign securities, including, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. In addition, holders of depositary receipts may have limited voting rights, may not have the same rights afforded to stockholders of a typical company in the event of a corporate action, such as an acquisition, merger or rights offering, and may experience difficulty in receiving company stockholder communications. There is no guarantee that a financial institution will continue to sponsor a depositary receipt, or that the depositary receipts will continue to trade on an exchange, either of which could adversely affect the liquidity, availability and pricing of the depositary receipt. Changes in foreign currency exchange rates will affect the value of depositary receipts and, therefore, may affect the value of your investment in the U.S. Equity Fund.

·   Large Companies Risk:  Larger, more established companies may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors.  Also, large-cap companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.

·   Sustainability (ESG) Policy Risk:  The U.S. Equity Fund’s ESG policy could cause it to perform differently compared to similar funds that do not have such a policy.  This ESG policy may result in the U.S. Equity Fund foregoing opportunities to buy certain securities when it might otherwise be advantageous to do so, or selling securities for ESG reasons when it might be otherwise disadvantageous for it to do so.  The U.S. Equity Fund will vote proxies in a manner which is consistent with its ESG criteria, which may not always be consistent with maximizing short-term performance of the issuer.

·   Real Estate Investment Trusts Risk:  REIT prices may fall because of the failure of borrowers to pay their loans and/or poor management. The value of REITs may also be affected by increases in property taxes and changes in tax laws and interest rates.

Risk Lose Money [Text]

rr_RiskLoseMoney

There is the risk that you could lose all or a portion of your investment in the U.S. Equity Fund

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The following performance information provides some indication of the risks of investing in the U.S. Equity Fund.  The bar chart below illustrates how the U.S. Equity Fund’s total returns have varied from year‑to‑year.  The table below illustrates how the U.S. Equity Fund’s average annual total returns for the 1-year, 5-year and since-inception periods compare with that of a broad-based securities index.  This comparison is provided to offer a broader market perspective.  The U.S. Equity Fund’s past performance, before and after taxes, is not necessarily an indication of how the U.S. Equity Fund will perform in the future and does not guarantee future results.  Updated performance information is available on the U.S. Equity Fund’s website at www.bostoncommonfunds.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following performance information provides some indication of the risks of investing in the U.S. Equity Fund.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.bostoncommonfunds.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

The U.S. Equity Fund’s past performance, before and after taxes, is not necessarily an indication of how the U.S. Equity Fund will perform in the future and does not guarantee future results.

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Return As of December 31,

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Highest Quarterly Return:	Q4, 2013	10.42%
Lowest Quarterly Return:	Q4, 2018	-13.56%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarterly Return:

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Dec. 31, 2013

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

10.42%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Return:

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2018

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(13.56%)

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

(reflects no deduction for fees, expenses or taxes)

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and does not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

Actual after-tax returns depend on the individual investor’s situation and may differ from those shown. Furthermore, the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or IRAs.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

In certain cases, Return After Taxes on Distribution and Sale of Fund Shares may be higher than the other return figures for the same period. This will occur when a capital loss is realized upon the sale of Fund shares or provides an assumed tax benefit that increases the return. Your actual after-tax returns depend on your tax situation and may differ from these shown.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and does not reflect the impact of state and local taxes.  Actual after-tax returns depend on the individual investor’s situation and may differ from those shown.  Furthermore, the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or IRAs.

In certain cases, Return After Taxes on Distribution and Sale of Fund Shares may be higher than the other return figures for the same period. This will occur when a capital loss is realized upon the sale of Fund shares or provides an assumed tax benefit that increases the return. Your actual after-tax returns depend on your tax situation and may differ from these shown.

Caption

rr_AverageAnnualReturnCaption

Average Annual Total Return as of December 31, 2018

Boston Common ESG Impact U.S. Equity Fund | S&P 500® Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

Label

rr_AverageAnnualReturnLabel

S&P 500® Index (reflects no deduction for fees, expenses or taxes)

Average Annual Returns, 1 Year

rr_AverageAnnualReturnYear01

(4.38%)

Average Annual Returns, 5 Years

rr_AverageAnnualReturnYear05

8.49%

Average Annual Returns, Since Inception

rr_AverageAnnualReturnSinceInception

11.47%

Average Annual Returns, Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 30, 2012

Boston Common ESG Impact U.S. Equity Fund | Boston Common ESG Impact U.S. Equity

Risk/Return:

rr_RiskReturnAbstract

Redemption Fee (as a percentage of Amount Redeemed)

rr_RedemptionFeeOverRedemption

(2.00%)

Management Fees

rr_ManagementFeesOverAssets

0.75%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.55%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.30%

Fee Reduction and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.30%)

Total Annual Fund Operating Expenses After Fee Reduction and/or Expense Reimbursement

rr_NetExpensesOverAssets

1.00%

^[1]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 102

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

382

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

684

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,541

Annual Return 2013

rr_AnnualReturn2013

31.76%

Annual Return 2014

rr_AnnualReturn2014

8.64%

Annual Return 2015

rr_AnnualReturn2015

1.95%

Annual Return 2016

rr_AnnualReturn2016

7.88%

Annual Return 2017

rr_AnnualReturn2017

20.65%

Annual Return 2018

rr_AnnualReturn2018

(8.45%)

Label

rr_AverageAnnualReturnLabel

Return Before Taxes

Average Annual Returns, 1 Year

rr_AverageAnnualReturnYear01

(8.45%)

Average Annual Returns, 5 Years

rr_AverageAnnualReturnYear05

5.70%

Average Annual Returns, Since Inception

rr_AverageAnnualReturnSinceInception

8.90%

Average Annual Returns, Inception Date

rr_AverageAnnualReturnInceptionDate

Apr. 30, 2012

Boston Common ESG Impact U.S. Equity Fund | Boston Common ESG Impact U.S. Equity | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

Average Annual Returns, 1 Year

rr_AverageAnnualReturnYear01

(9.58%)

Average Annual Returns, 5 Years

rr_AverageAnnualReturnYear05

5.04%

Average Annual Returns, Since Inception

rr_AverageAnnualReturnSinceInception

8.20%

Boston Common ESG Impact U.S. Equity Fund | Boston Common ESG Impact U.S. Equity | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

Label

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

Average Annual Returns, 1 Year

rr_AverageAnnualReturnYear01

(4.20%)

Average Annual Returns, 5 Years

rr_AverageAnnualReturnYear05

4.44%

Average Annual Returns, Since Inception

rr_AverageAnnualReturnSinceInception

7.06%

[1] The Adviser has contractually agreed to reduce its fees and/or pay U.S. Equity Fund expenses (excluding acquired fund fees and expenses, interest expense in connection with investment activities, taxes and extraordinary expenses) in order to limit Total Annual Fund Operating Expenses After Fee Reduction and/or Expense Reimbursement to 1.00% of the U.S. Equity Fund's average daily net assets (the "Expense Cap"). The Expense Cap is indefinite, but will remain in effect until at least January 31, 2020 and may be terminated at any time by the Trust's Board of Trustees (the "Board") upon 60 days' notice to the Adviser, or by the Adviser with consent of the Board. The Adviser is permitted, with Board approval, to be reimbursed for fee reductions and/or expense payments made in the prior three years. This reimbursement may be requested if the aggregate amount actually paid by the U.S. Equity Fund toward operating expenses for such period (taking into account any reimbursement) does not exceed the lesser of the Expense Cap in place at the time of waiver or at the time of reimbursement.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Prospectus Date	rr_ProspectusDate	Jan. 30, 2019