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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Jan. 31, 2022
Entity Registrant Name dei_EntityRegistrantName WALTHAUSEN FUNDS
Entity Central Index Key dei_EntityCentralIndexKey 0001418191
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate May 27, 2022
Document Effective Date dei_DocumentEffectiveDate Jun. 01, 2022
Prospectus Date rr_ProspectusDate Jun. 01, 2022
Walthausen Small Cap Value Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Summary Section
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

• The Walthausen Small Cap Value Fund seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following table describes the expenses and fees that you may pay if you buy and hold shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
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 May 31, 2023
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover 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 example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 71.40% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 71.40%
Expense Example [Heading] rr_ExpenseExampleHeading Expense Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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% annual return each year and that the Fund’s operating expenses remain the same each year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading The Principal Investment Strategy of the Fund
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund invests primarily in common stocks of small capitalization companies that the Advisor believes have the potential for capital appreciation. Small capitalization companies are defined as those with market capitalizations of $2 billion or less at the time of purchase. Under normal circumstances, the Fund will invest at least 80% of its net assets plus any borrowing for investment purposes in common stocks of small capitalization companies, as defined above. The Fund emphasizes a “value”*investment style, investing in companies that appear under-priced according to certain financial measurements of their worth or business prospects.
Risk [Heading] rr_RiskHeading The Principal Risks of Investing in the Fund
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

As with all mutual funds, there is the risk that you could lose some or all of your investment in the Fund.

Risks of Investing in Small Capitalization Companies

The Fund invests in the stocks of small capitalization companies, which may subject the Fund to additional risks. The earnings and prospects of these companies are generally more volatile than larger companies and small capitalization companies may experience higher failure rates than do larger companies.

Risks in General

Domestic economic growth and market conditions, interest rate levels, and political events are among the factors affecting the securities markets in which the Fund invests. There is risk that these and other factors may adversely affect the Fund’s performance.

Additionally, unexpected local, regional or global events, such as war; acts of terrorism; financial, political or social disruptions; natural, environmental or man-made disasters; the spread of infectious illnesses or other public health issues (such as COVID-19); and recessions and depressions could have a significant impact on the Fund and its investments and may impair market liquidity. Such events can cause investor fear, which can adversely affect the economies of nations, regions and the market in general, in ways that cannot necessarily be foreseen.

Risks of Investing in Common Stocks

Overall stock market risks may affect the value of the Fund. Factors such as domestic economic growth and market conditions, interest rate levels, and political events affect the securities markets. When the value of the Fund’s investments goes down, your investment in the Fund decreases in value and you could lose money.

Value Investing Risk

Value investing attempts to identify companies selling at a discount to their intrinsic value. Value investing is subject to the risk that a company’s intrinsic value may never be fully realized by the market or that a company judged by the Advisor to be undervalued may actually be appropriately priced.

Sector Risk

Sector risk is the possibility that all stocks within the same group of industries will decline in price due to sector-specific market or economic developments. The Fund may be overweight in certain sectors at various times.

Investment Management Risk

The Advisor’s strategy may fail to produce the intended results.
Risk Lose Money [Text] rr_RiskLoseMoney When the value of the Fund’s investments goes down, your investment in the Fund decreases in value and you could lose money.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and performance table below show the variability of the Fund’s returns, which is some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund’s performance from calendar year to year for the past ten years, together with the best and worst quarters during that time. The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Returns and performance below are for the Investor Class shares. Because the Investor Class has higher expenses than the Institutional Class, its performance typically would have been lower than that of the Institutional Class. Updated performance information is available on the Fund’s website at www.walthausenfunds.com or by calling 1-888-925-8428.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and performance table below show the variability of the Fund’s returns, which is some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-888-925-8428
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.walthausenfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

The year-to-date return as of March 31, 2022 was -6.12% for the Investor Class.

Best Quarter (December 31, 2020) +27.27%    Worst Quarter (March 31, 2020) -34.21%
Performance Table Heading rr_PerformanceTableHeading AVERAGE ANNUAL TOTAL RETURN  FOR THE PERIODS ENDED 12/31/21 
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Walthausen Small Cap Value Fund | Russell 2000 Value Index (does not reflect deductions for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 28.27%
5 Years rr_AverageAnnualReturnYear05 9.07%
10 Years rr_AverageAnnualReturnYear10 12.03%
Walthausen Small Cap Value Fund | Institutional  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol WFICX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.38%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.38%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.40%) [1]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.98%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 100
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 398
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 717
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,623
1 Year rr_AverageAnnualReturnYear01 37.28% [2]
5 Years rr_AverageAnnualReturnYear05 [2]
10 Years rr_AverageAnnualReturnYear10 [2]
Walthausen Small Cap Value Fund | Investor  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol WSCVX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.38%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.38%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.17%) [1]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.21%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 123
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 420
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 739
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,643
Annual Return 2012 rr_AnnualReturn2012 32.12%
Annual Return 2013 rr_AnnualReturn2013 35.23%
Annual Return 2014 rr_AnnualReturn2014 3.82%
Annual Return 2015 rr_AnnualReturn2015 (12.66%)
Annual Return 2016 rr_AnnualReturn2016 30.99%
Annual Return 2017 rr_AnnualReturn2017 10.58%
Annual Return 2018 rr_AnnualReturn2018 (19.05%)
Annual Return 2019 rr_AnnualReturn2019 20.69%
Annual Return 2020 rr_AnnualReturn2020 (0.11%)
Annual Return 2021 rr_AnnualReturn2021 36.99%
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2022
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (6.12%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 27.27%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (34.21%)
1 Year rr_AverageAnnualReturnYear01 36.99%
5 Years rr_AverageAnnualReturnYear05 8.14%
10 Years rr_AverageAnnualReturnYear10 12.11%
Walthausen Small Cap Value Fund | Investor | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 25.39%
5 Years rr_AverageAnnualReturnYear05 5.20%
10 Years rr_AverageAnnualReturnYear10 9.66%
Walthausen Small Cap Value Fund | Investor | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 25.78%
5 Years rr_AverageAnnualReturnYear05 5.70%
10 Years rr_AverageAnnualReturnYear10 9.35%
Walthausen Focused Small Cap Value Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Summary Section
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

• The Walthausen Focused Small Cap Value Fund seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following table describes the expenses and fees that you may pay if you buy and hold shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
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 May 31, 2026
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover 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 example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 59.71% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 59.71%
Expense Example [Heading] rr_ExpenseExampleHeading Expense Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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% annual return each year and that the Fund’s operating expenses remain the same each year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading The Principal Investment Strategy of the Fund
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund invests primarily in common stocks of small capitalization companies that Walthausen & Co., LLC (the "Advisor") believes have the potential for capital appreciation. The Advisor invests in small capitalization companies with market capitalizations below that of the largest member of the Russell 2000 Index at the time of purchase. As of April 30, 2022, the capitalization of the largest member of the Russell 2000 Index was $15.1 billion. The Fund typically invests in 30 to 50 companies. Under normal circumstances, the Fund will invest at least 80% of its net assets (plus any borrowings for investment purposes) in U.S. common stocks of small capitalization companies, as defined above. The Fund emphasizes a "value" investment style, investing in companies that appear underpriced according to certain financial measurements of their worth or business prospects. Financial measures which are used to assess value are Price to Book ratio and Enterprise Value to EBITDA (Earnings before interest, taxes, depreciation and amortization) ratio and other widely used valuation metrics. Those ratios are compared to similar metrics for the market and comparable securities. The Advisor defines Enterprise Value as the market value of a company's equity, debt and unfunded pension claims, less cash. EBITDA is a company's earnings before interest, taxes, depreciation and amortization.

The Advisor may sell a company when the company reaches the Advisor's projection of the stock's future target price, as determined by applying the Advisor's understanding of historical valuation metrics, when there is a more attractively priced company as an alternative, when the fundamentals of the business have changed, or when the Advisor determines that management of the company is not enhancing shareholder value. These portfolio reviews are conducted continuously through close monitoring of stock prices, changes in the economy, and corporate developments.
Risk [Heading] rr_RiskHeading The Principal Risks of Investing in the Fund
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

As with all mutual funds, there is the risk that you could lose some or all of your investment in the Fund.

Risks of Investing in Small Capitalization Companies

The Fund invests in the stocks of small capitalization companies, which may subject the Fund to additional risks. The earnings and prospects of these companies are generally more volatile than larger companies and small capitalization companies may experience higher failure rates than do larger companies.

Risks in General

Domestic economic growth and market conditions, interest rate levels, and political events are among the factors affecting the securities markets in which the Fund invests. There is risk that these and other factors may adversely affect the Fund’s performance.

Additionally, unexpected local, regional or global events, such as war; acts of terrorism; financial, political or social disruptions; natural, environmental or man-made disasters; the spread of infectious illnesses or other public health issues (such as COVID-19); and recessions and depressions could have a significant impact on the Fund's investments and could impair market liquidity. Such events can cause investor fear, which can adversely affect the economies of nations, regions and the market in general, in ways that cannot necessarily be foreseen.

Risks of Investing in Common Stocks

Overall stock market risks may affect the value of the Fund. Factors such as domestic economic growth and market conditions, interest rate levels, and political events affect the securities markets. When the value of the Fund’s investments goes down, your investment in the Fund decreases in value and you could lose money.

Value Investing Risk

Value investing attempts to identify companies selling at a discount to a projected future value. Value investing is subject to the risk that a company's intrinsic value may never be fully realized by the market or that a company judged by the Adviser to be undervalued may actually be appropriately priced.

Sector Risk

Sector risk is the possibility that all stocks within the same group of industries will decline in price due to sector-specific market or economic developments. The Fund may be overweight in certain sectors at various times.

Investment Management Risk

The Advisor’s strategy may fail to produce the intended results.
Risk Lose Money [Text] rr_RiskLoseMoney When the value of the Fund’s investments goes down, your investment in the Fund decreases in value and you could lose money.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and performance table below show the variability of the Fund’s returns, which is some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund’s performance from calendar year to year for the past ten years, together with the best and worst quarters during that time. The performance table compares the performance of the Fund’s Institutional Class shares over time to the performance of a broad-based market index. You should be aware that the Fund’s past performance (before and after taxes) may not be an indication of how the Fund will perform in the future. Updated performance information is available on the Fund’s website at www.walthausenfunds.com or by calling 1-888-925-8428. Prior to October 15, 2020 the Fund was called the Walthausen Select Value Fund.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and performance table below show the variability of the Fund’s returns, which is some indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-888-925-8428
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.walthausenfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture You should be aware that the Fund’s past performance (before and after taxes) may not be an indication of how the Fund will perform in the future.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

The year-to-date return as of March 31, 2022 was 0.49% for the Institutional Class.

Best Quarter (December 31, 2020) +27.00%      Worst Quarter (March 31, 2020) -30.51%
Performance Table Heading rr_PerformanceTableHeading AVERAGE ANNUAL TOTAL RETURN FOR THE PERIODS ENDED 12/31/21 
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Walthausen Focused Small Cap Value Fund | Russell 2000 Value Index (does not reflect deductions for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 28.27%
5 Years rr_AverageAnnualReturnYear05 9.07%
10 Years rr_AverageAnnualReturnYear10 12.03%
Walthausen Focused Small Cap Value Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol WSVIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.20%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.05%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.20%) [3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.85%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 87
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 271
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 495
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,204
Annual Return 2012 rr_AnnualReturn2012 21.18%
Annual Return 2013 rr_AnnualReturn2013 42.57%
Annual Return 2014 rr_AnnualReturn2014 2.22%
Annual Return 2015 rr_AnnualReturn2015 (7.29%)
Annual Return 2016 rr_AnnualReturn2016 14.42%
Annual Return 2017 rr_AnnualReturn2017 17.51%
Annual Return 2018 rr_AnnualReturn2018 (14.05%)
Annual Return 2019 rr_AnnualReturn2019 28.98%
Annual Return 2020 rr_AnnualReturn2020 (0.23%)
Annual Return 2021 rr_AnnualReturn2021 28.33%
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2022
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.49%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 27.00%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (30.51%)
1 Year rr_AverageAnnualReturnYear01 28.33%
5 Years rr_AverageAnnualReturnYear05 10.77%
10 Years rr_AverageAnnualReturnYear10 12.07%
Walthausen Focused Small Cap Value Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 21.67%
5 Years rr_AverageAnnualReturnYear05 6.98%
10 Years rr_AverageAnnualReturnYear10 9.72%
Walthausen Focused Small Cap Value Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 19.20%
5 Years rr_AverageAnnualReturnYear05 7.50%
10 Years rr_AverageAnnualReturnYear10 9.28%
[1] The Advisor has contractually agreed to waive Services Agreement fees and Management Fees to the extent necessary to maintain total annual operating expenses of the Institutional Class Shares and Investor Class Shares, excluding brokerage fees and commissions, taxes, borrowing costs (such as (a) interest and (b) dividend expenses on securities sold short), the cost of acquired funds and extraordinary expenses at 0.98% and 1.21% respectively, of its average daily net assets through May 31, 2023. The Advisor may not terminate the fee waiver before May 31, 2023. The Trustees may terminate the expense waiver upon notice to the Advisor.
[2] Institutional Class inception date 12/31/18. 
[3] The Advisor has contractually agreed to waive Services Agreement fees to the extent necessary to maintain total annual operating expenses of the Institutional Class Shares, excluding brokerage fees and commissions, taxes, borrowing costs (such as (a) interest and (b) dividend expenses on securities sold short), the cost of acquired funds and extraordinary expenses at 0.85% of its average daily net assets through May 31, 2026. The Advisor may not terminate the fee waiver before May 31, 2026. The Trustees may terminate the expense waiver upon notice to the Advisor.