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Institutional Class Prospectus | PIA High Yield Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading PIA High Yield Fund
Objective [Heading] rr_ObjectiveHeading Investment Objectives
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Fund’s primary objective is to seek a high level of current income.
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock

The Fund’s secondary objective is to seek capital growth when that is consistent with its primary objective.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold Institutional Class shares of the Fund. You may be required to pay brokerage commissions on your purchases and sales of Institutional Class shares of the Fund by certain financial intermediaries, which are not reflected in this table.

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 Mar. 29, 2020
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 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 Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 48% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 48.00%
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 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% return each year and that the Fund’s operating expenses remain the same (taking into account the temporary expense limitation only in the first year). You may be required to pay brokerage commissions on your purchases and sales of Institutional Class shares of the Fund, which are not reflected in this table.
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 of the Fund
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund invests, under normal circumstances, at least 80% of its net assets (plus any borrowings for investment purposes) in a diversified portfolio of domestic and foreign high yield instruments (“junk bonds”), defined as bonds, convertible securities, forward commitments, loan participations and assignments, preferred stocks and Rule 144A securities. High yield instruments are securities rated below investment grade as defined by the Bloomberg Barclays index methodology, or equivalently rated by Standard & Poor’s Rating Services (“S&P”) or Fitch, Inc. (“Fitch”), or, if unrated, determined by the Adviser to be of comparable quality.


The remainder of the Fund’s assets may be invested in investment grade instruments including bonds, debt securities, convertible securities, and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities, and loan participations and assignments.


The average portfolio duration of the Fund normally varies within two years (plus or minus) of the duration of the Bloomberg Barclays U.S. Corporate High-Yield Index (the “Barclays Index”) at any point in time. The Barclays Index had a duration of 3.67 years as of January 31, 2019. Duration is a measure of the expected life of a fixed income security that is used to determine the sensitivity of a security’s price to changes in interest rates.


The Fund may invest up to 10% of its net assets in securities and instruments that are economically tied to emerging market countries.


The Fund may invest up to 5% of its net assets in derivative instruments, such as options, futures contracts or swap agreements for both bona fide hedging purposes and for speculative purposes. From time to time, the Fund may experience significant inflows; if this occurs, the Fund may, on a temporary or interim basis, invest these new assets (potentially in an amount which may approach up to 50% of the Fund’s total net assets if new flows were extremely large relative to the Fund’s current assets) in a combination of derivative instruments and other investment companies, including exchange-traded funds (“ETFs”), until such time as the Adviser can identify and invest in appropriate high yield instruments in accordance with the Fund’s principal strategy. The Fund may purchase or sell securities on a when-issued, delayed delivery or forward commitment basis. The Fund may, without limitation, seek to obtain market exposure to the securities in which it primarily invests by entering into a series of purchase and sale contracts or by using other investment techniques (such as buy backs or dollar rolls).


In selecting investments for the Fund, the Adviser will consider the risks and opportunities presented by the industries within the high yield universe. The Adviser evaluates the bond issuers within the selected industries and identifies those investments which the Adviser believes have favorable risk reward characteristics and match the Adviser’s investing philosophy. The Adviser evaluates various criteria such as historical and future expected financial performance, management tenure and experience, capital structure, free cash flow generation, barriers to entry, security protections, yield and relative value, and ownership structure. Investments are targeted that have individual yield premiums which appear to be favorable and are viewed by the Adviser as having a comparable or lower probability of default and/or loss risk.
Risk [Heading] rr_RiskHeading Principal Risks of Investing in the Fund
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

Losing all or a portion of your investment is a risk of investing in the Fund. The success of the Fund cannot be guaranteed. There are risks associated with investments in the types of securities in which the Fund invests. These risks include:



 ● High Yield Securities Risk. High yield securities (or “junk bonds”) entail greater risk of loss of principal because of their greater exposure to credit risk. High yield securities typically carry higher coupon rates than investment grade securities, but also are considered as speculative and may be subject to greater market price fluctuations, less liquidity and greater risk of loss of income or principal including greater possibility of default and bankruptcy of the issuer of such instruments than more highly rated bonds and loans.


● Counterparty Risk. Fund transactions involving a counterparty are subject to the risk that the counterparty or a third party will not fulfill its obligation to the Fund. Counterparty risk may arise because of the counterparty’s financial condition (i.e., financial difficulties, bankruptcy, or insolvency), market activities and developments, or other reasons, whether foreseen or not. A counterparty’s inability to fulfill its obligation may result in significant financial loss to the Fund.

● Credit Risk. The issuers of the bonds and other instruments held by the Fund may not be able to make interest or principal payments.


● 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.

● Management Risk. The Fund is an actively managed portfolio. The Adviser’s management practices and investment strategies might not work to produce the desired results.


● Interest Rate Risk. The value of the Fund’s investments in fixed-income securities will change based on changes in interest rates. If interest rates increase, the value of these investments generally declines. Securities with greater interest rate sensitivity and longer maturities generally are subject to greater fluctuations in value. Given that the Federal Reserve has begun to raise interest rates, the Fund may face a heightened level of interest rate risk.


● Liquidity Risk. Reduced liquidity in the bond markets can result from a number of events, such as limited trading activity, reductions in bond inventory, and rapid or unexpected changes in interest rates. Less liquid markets could lead to greater price volatility and limit the Fund’s ability to sell a holding at a suitable price.


● Derivatives Risk. Derivatives involve the risk of improper valuation, the risk of ambiguous documentation and the risk that changes in the value of the derivative may not correlate closely with the underlying security. Losses from a derivative instrument may be greater than the amount invested in the derivative instrument. Certain derivatives have the potential for unlimited losses, regardless of the size of the initial investment.


● ETF and Mutual Fund Risk. When the Fund invests in an ETF or mutual fund, it will bear additional expenses based on its pro rata share of the ETF’s or mutual fund’s operating expenses, including the potential duplication of management fees. The risk of owning an ETF or mutual fund generally reflects the risks of owning the underlying securities that the ETF or mutual fund holds. The Fund also will incur brokerage costs when it purchases ETFs.


● Preferred Stock Risk. Preferred stocks may be more volatile than fixed income securities and are more correlated with the issuer’s underlying common stock than fixed income securities. Additionally, the dividend on a preferred stock may be changed or omitted by the issuer.


● Foreign and Emerging Market Securities Risk. Investments in foreign currencies and foreign issuers are subject to additional risks, including political and economic risks, greater volatility, civil conflicts and war, sanctions or other measures by the United States or other governments, liquidity risks, currency fluctuations, higher transaction costs, delayed settlement, possible foreign controls on investment, expropriation and nationalization risks, and less stringent investor protection and disclosure standards of foreign markets. Events and evolving conditions in certain economies or markets may alter the risks associated with investments tied to countries or regions that historically were perceived as comparatively stable becoming riskier and more volatile. These risks are magnified in countries in “emerging markets.” Emerging market countries typically have less-established market economies than developed countries and may face greater social, economic, regulatory and political uncertainties. In addition, emerging markets typically present greater illiquidity and price volatility concerns due to smaller or limited local capital markets and greater difficulty in determining market valuations of securities due to limited public information on issuers.


● Loan Participation and Assignment Risk. Loan participations and assignments involve special types of risk, including credit risk, interest rate risk, liquidity risk, and the risks of being a lender. Bank loans (i.e., loan participations and assignments), like other high yield corporate debt obligations, have a higher risk of default and may be less liquid and/or become illiquid.


● Rule 144A Securities Risk. The market for Rule 144A securities typically is less active than the market for publicly-traded securities. Rule 144A securities carry the risk that the liquidity of these securities may become impaired, making it more difficult for the Fund to sell these securities.


● Convertible Securities Risk. Convertible securities are subject to the risks of both debt securities and equity securities. The values of convertible securities tend to decline as interest rates rise and, due to the conversion feature, tend to vary with fluctuations in the market value of the underlying common or preferred stock.
Risk Lose Money [Text] rr_RiskLoseMoney Losing all or a portion of your investment is a risk of investing in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following performance information indicates some of the risks of investing in the Fund. The bar chart shows the annual returns for the Fund from year to year. The table shows how the Fund’s average annual total returns for the 1-year, 5-year and since inception periods compare with those of a broad measure of market performance. Effective at the close of business on December 31, 2014, the former Investor Class shares were re-designated as Institutional Class shares. The performance shown below reflects the performance of the former Investor Class and includes expenses that are not applicable to and are higher than those of the Institutional Class. The performance for the Institutional Class shares would differ only to the extent that the Institutional Class shares have different expenses than the former Investor Class shares. The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available on the Fund’s website at www.pacificincome.com/mutual-funds or by calling the Fund toll-free at 1-800-251-1970.

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information indicates some of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-251-1970
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.pacificincome.com/mutual-funds
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 [Heading] rr_BarChartHeading Calendar Year Total Return as of December 31 – Institutional Class
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

During the period shown on the bar chart, the Fund’s Institutional Class highest total return for a quarter was 5.48% (quarter ended December 31, 2011) and the lowest total return for a quarter was -5.06% (quarter ended December 31, 2018).

Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest total return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2011
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 5.48%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest total return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (5.06%)
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 The after-tax returns were 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 are not relevant to investors who hold shares of the Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher The Return After Taxes on Distributions and Sale of Fund Shares is higher than other return figures when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

The after-tax returns were 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 are not relevant to investors who hold shares of the Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”). The Return After Taxes on Distributions and Sale of Fund Shares is higher than other return figures when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.

Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (for the periods ended December 31, 2018)
Institutional Class Prospectus | PIA High Yield Fund | Bloomberg Barclays U.S. Corporate High-Yield Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Bloomberg Barclays U.S. Corporate High-Yield Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (2.08%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.83%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.85%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2010
Institutional Class Prospectus | PIA High Yield Fund | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
SHAREHOLDER FEES (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fees rr_ManagementFeesOverAssets 0.55%
Distribution and Service (Rule 12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.44%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.99%
Less: Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.13%) [1]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 0.86%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 88
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 302
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 534
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,201
Annual Return 2011 rr_AnnualReturn2011 4.49%
Annual Return 2012 rr_AnnualReturn2012 13.48%
Annual Return 2013 rr_AnnualReturn2013 8.43%
Annual Return 2014 rr_AnnualReturn2014 1.94%
Annual Return 2015 rr_AnnualReturn2015 (1.52%)
Annual Return 2016 rr_AnnualReturn2016 14.51%
Annual Return 2017 rr_AnnualReturn2017 8.04%
Annual Return 2018 rr_AnnualReturn2018 (2.77%)
Label rr_AverageAnnualReturnLabel Institutional Class Shares Return before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (2.77%) [2]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.84% [2]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.65% [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2010
Institutional Class Prospectus | PIA High Yield Fund | Institutional Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Institutional Class Shares Return after Taxes on Distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (5.16%) [2]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.15% [2]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.01% [2]
Institutional Class Prospectus | PIA High Yield Fund | Institutional Class | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Institutional Class Shares Return after Taxes on Distributions and Sale of Fund shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (1.59%) [2]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.72% [2]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.22% [2]
[1] Pacific Income Advisers, Inc. (the "Adviser") has agreed to temporarily pay for all operating expenses (excluding acquired fund fees and expenses ("AFFE"), interest, taxes and extraordinary expenses) incurred by the Fund through at least March 29, 2020 to the extent necessary to limit Total Annual Fund Operating Expenses for the Fund to 0.86% of the average daily net assets of the Institutional Class shares (the "temporary expense limitation"). The temporary expense limitation may be discontinued at any time by the Board of Trustees. The Adviser may not recoup amounts subject to the temporary expense limitation in future periods. AFFE are the indirect costs of investing in other investment companies, such as a money market funds.
[2] The former Investor Class shares were re-designated as Institutional Class shares at the close of business on December 31, 2014. Performance shown prior to January 1, 2015 reflects the performance of the former Investor Class and includes expenses that are not applicable to and are higher than those of the Institutional Class.