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PIA Short-Term Securities Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading PIA Short-Term Securities Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund’s investment objective is to seek a high level of current income, consistent with low volatility of principal through investing in short-term investment grade debt securities.
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 shares of the Fund. You may be required to pay brokerage commissions on your purchases and sales of Advisor 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 28% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 28.00%
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 Expense Cap only in the first year).  You may be required to pay brokerage commissions on your purchases and sales of Advisor 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 is a diversified investment company that normally invests at least 80% of its net assets in short-term securities having a duration of less than three years.  Under normal market conditions, the Fund purchases securities rated BBB- and/or Baa3 or better by a Nationally Recognized Statistical Rating Organization (“NRSRO”).

The Fund primarily invests in securities issued or guaranteed by the U.S. Government and its agencies, investment grade mortgage-backed securities (including commercial mortgage-backed securities and residential mortgage-backed securities), and investment grade debt securities (including corporate debt securities, asset-backed securities and collateralized mortgage obligations).  The Fund may also invest in Rule 144A securities.

The Fund may invest up to 20% of its net assets in debt futures contracts, option contracts, options on securities and options on debt futures.  The Fund may invest in these types of derivative securities for both bona fide hedging purposes and for speculative purposes.

The Fund may invest up to 10% of its net assets in other investment companies (mutual funds and exchange-traded funds (“ETFs”)), including in any mutual fund advised by the Adviser (a “PIA Fund”), provided that investment in an investment company that predominantly invests in high yield (‘junk bond”) securities will count towards the Fund’s limitation of no more than 5% of the Fund’s net assets invested in high yield securities.  To the extent that the Fund invests in a PIA Fund, the Adviser will waive any management fee charged by the PIA Fund.

Duration is a measure of a debt security’s price sensitivity.  Higher duration indicates bonds that are more sensitive to interest rate changes.  Bonds with shorter duration have lower risk associated with interest rates.  Duration takes into account a debt security’s cash flows over time including the possibility that a debt security might be prepaid by the issuer or redeemed by the holder prior to its stated maturity date.  In contrast, maturity measures only the time until final payment is due.  The weighted average duration of the Fund portfolio will generally range from six months on the short end to three years on the long end.

In selecting investments for the Fund, the Adviser primarily will consider credit quality, duration and yield.
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:

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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.

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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.

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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.

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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.

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

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Prepayment Risk.  Issuers of securities held by the Fund may be able to prepay principal due on these securities, particularly during periods of declining interest rates.  Securities subject to prepayment risk generally offer less potential for gains when interest rates decline, and may offer a greater potential for loss when interest rates rise.  When debt obligations are prepaid or when securities are called, the Fund may have to reinvest in securities with a lower yield.  Prepayment risk is a major risk of mortgage-backed securities.

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Extension Risk.   An issuer may pay principal on an obligation held by the Fund (such as an asset-backed or mortgage-backed security) later than expected.  This may happen during a period of rising interest rates.  Under these circumstances, the value of the obligation will decrease.

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Risks Associated with Asset-Backed Securities.  These include Market and Regulatory Risk, Interest Rate Risk, Credit Risk, Prepayment Risk and Extension Risk (each described above).  During periods of difficult or frozen credit markets, significant changes in interest rates, or deteriorating economic conditions, such securities may decline in value, face valuation difficulties, become more volatile and/or become illiquid.

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Risks Associated with Mortgage-Backed Securities.  These include Market and Regulatory Risk, Interest Rate Risk, Credit Risk, Prepayment Risk and Extension Risk (each described above) as well as the risk that the structure of certain mortgage-backed securities may make their reaction to interest rates and other factors difficult to predict, making their prices very volatile.  In particular, events related to the U.S. housing market in recent years had a severe negative impact on the value of some mortgage-backed securities and resulted in an increased risk associated with investments in the securities.

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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.

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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.

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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.

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Adjustable Rate and Floating Rate Securities Risks.  Although adjustable and floating rate debt securities tend to be less volatile than fixed-rate debt securities, they nevertheless fluctuate in value.

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Risks Associated with Inflation and Deflation.  Inflation risk is the risk that increasing prices throughout the economy may erode the purchasing power of an investment over time.  Deflation risk is the risk that prices throughout the economy decline over time – the opposite of inflation.

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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.

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High Yield Securities Risk.  Securities with ratings lower than BBB- or Baa3 are known as “high yield” securities (commonly known as “junk bonds”).  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.
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 provides some indication 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 returns for 1-year, 5-years, and 10-years compare with those of a broad measure of market performance.  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 provides some indication 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 Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the period shown on the bar chart, the Fund’s highest total return for a quarter was 0.65% (quarter ended June 30, 2016) and the lowest total return for a quarter was ‑0.25% (quarter ended June 30, 2013).
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest total return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2016
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.65%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest total return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2013
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (0.25%)
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)
PIA Short-Term Securities Fund | ICE BofA Merrill Lynch 1-Year U.S. Treasury Note Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel ICE BofA Merrill Lynch 1-Year U.S. Treasury Note Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.86%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.70%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.62%
PIA Short-Term Securities Fund | Advisor Class  
Risk/Return: rr_RiskReturnAbstract  
SHAREHOLDER FEES (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fees rr_ManagementFeesOverAssets 0.20%
Other Expenses rr_OtherExpensesOverAssets 0.22%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.42%
Less: Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.03%) [1]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 0.39%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 40
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 132
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 232
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 527
Annual Return 2009 rr_AnnualReturn2009 1.62%
Annual Return 2010 rr_AnnualReturn2010 1.08%
Annual Return 2011 rr_AnnualReturn2011 0.55%
Annual Return 2012 rr_AnnualReturn2012 0.40%
Annual Return 2013 rr_AnnualReturn2013 0.27%
Annual Return 2014 rr_AnnualReturn2014 0.35%
Annual Return 2015 rr_AnnualReturn2015 0.28%
Annual Return 2016 rr_AnnualReturn2016 1.46%
Annual Return 2017 rr_AnnualReturn2017 0.95%
Annual Return 2018 rr_AnnualReturn2018 1.19%
Label rr_AverageAnnualReturnLabel PIA Short-Term Securities Fund Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.19%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.85%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.81%
PIA Short-Term Securities Fund | Advisor Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel PIA Short-Term Securities Fund Return After Taxes on Distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.54%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.39%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.44%
PIA Short-Term Securities Fund | Advisor Class | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel PIA Short-Term Securities Fund Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.70%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.44%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.47%
[1] Pacific Income Advisers, Inc. (the "Adviser") has contractually agreed to waive all or a portion of its management fees and pay expenses of the Fund to the extent necessary to limit Total Annual Fund Operating Expenses for the Fund (excluding acquired fund fees and expenses ("AFFE"), interest, taxes and extraordinary expenses) to 0.39% of the Fund's average daily net assets (the "Expense Cap"). The Expense Cap will remain in effect through at least March 29, 2020, and may be terminated only by the Trust's Board of Trustees (the "Board" or the "Trustees"). The Adviser may request recoupment of previously waived fees and paid expenses from the Fund for three years from the date they were waived or paid, subject to the Expense Cap. AFFE are the indirect costs of investing in other investment companies, such as a money market funds.