Label	Element	Value
CornerCap Large/Mid-Cap Value Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	CornerCap Large/Mid-Cap Value Fund
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategies
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	To meet its investment objective, the Large/Mid-Cap Value Fund typically invests 80% or more of its net assets in U.S. common stocks of large-cap and mid-cap companies. The Adviser defines large-cap and mid-cap companies to be those companies with market capitalizations within the range of the Russell 1000® Index at the time of purchase that the Adviser believes are attractively valued relative to the market. The market capitalization range of the Russell 1000® Index was $205.1 million to $786.4 billion as of March 31, 2017, and is expected to change frequently. The Adviser uses Fundametrics®, the Adviser's proprietary quantitative research system, to select stocks for the Large/Mid-Cap Value Fund. Fundametrics® evaluates all stocks in the Fund's investible universe with respect to over 120 fundamental factors. Fundametrics® was designed to evaluate stocks on many of the same criteria used by a human analyst, but is done using a systematic approach that minimizes human emotion and bias. Buy and sell decisions are determined by a subset of factors contained within the Fundametrics® "Alpha Composite" and "Financial Warnings Overlay". The Alpha Composite is a combination of alpha seeking factors designed to identify stocks with potential for excess returns. The makeup of the Alpha Composite is primarily valuation-focused factors, but also includes certain growth, momentum and other factors with low correlations to value for diversification purposes. The Financial Warnings Overlay is then applied to the Fund's investible universe of stocks using a separate set of risk factors designed to identify stocks with risk levels that the Adviser believes will lead to under performance. The Financial Warnings Overlay is designed to avoid high risk stocks that otherwise have attractive valuation metrics. Potential "buy" stocks - those that score highly with respect to the Alpha Composite and pass the Financial Warnings Overlay - are then evaluated with respect to whether they would improve portfolio diversification. The Large/Mid-Cap Value Fund typically sells stocks that score low on the Alpha Composite or are flagged by the Financial Warnings Overlay as presenting unreasonable risk. The Large/Mid-Cap Value Fund may also invest in exchange-traded funds ("ETFs") or other investment companies that hold securities in which the Large/Mid-Cap Value Fund may directly invest.
Strategy Portfolio Concentration [Text]	rr_StrategyPortfolioConcentration	To meet its investment objective, the Large/Mid-Cap Value Fund typically invests 80% or more of its net assets in U.S. common stocks of large-cap and mid-cap companies.

Label

Element

Value

Risk/Return:

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Risk/Return [Heading]

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CornerCap Large/Mid-Cap Value Fund

Strategy [Heading]

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Principal Investment Strategies

Strategy Narrative [Text Block]

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To meet its investment objective, the Large/Mid-Cap Value Fund typically invests 80% or more of its net assets in U.S. common stocks of large-cap and mid-cap companies. The Adviser defines large-cap and mid-cap companies to be those companies with market capitalizations within the range of the Russell 1000® Index at the time of purchase that the Adviser believes are attractively valued relative to the market. The market capitalization range of the Russell 1000® Index was $205.1 million to $786.4 billion as of March 31, 2017, and is expected to change frequently. The Adviser uses Fundametrics®, the Adviser's proprietary quantitative research system, to select stocks for the Large/Mid-Cap Value Fund. Fundametrics® evaluates all stocks in the Fund's investible universe with respect to over 120 fundamental factors. Fundametrics® was designed to evaluate stocks on many of the same criteria used by a human analyst, but is done using a systematic approach that minimizes human emotion and bias.

Buy and sell decisions are determined by a subset of factors contained within the Fundametrics® "Alpha Composite" and "Financial Warnings Overlay". The Alpha Composite is a combination of alpha seeking factors designed to identify stocks with potential for excess returns. The makeup of the Alpha Composite is primarily valuation-focused factors, but also includes certain growth, momentum and other factors with low correlations to value for diversification purposes. The Financial Warnings Overlay is then applied to the Fund's investible universe of stocks using a separate set of risk factors designed to identify stocks with risk levels that the Adviser believes will lead to under performance. The Financial Warnings Overlay is designed to avoid high risk stocks that otherwise have attractive valuation metrics. Potential "buy" stocks - those that score highly with respect to the Alpha Composite and pass the Financial Warnings Overlay - are then evaluated with respect to whether they would improve portfolio diversification. The Large/Mid-Cap Value Fund typically sells stocks that score low on the Alpha Composite or are flagged by the Financial Warnings Overlay as presenting unreasonable risk.

The Large/Mid-Cap Value Fund may also invest in exchange-traded funds ("ETFs") or other investment companies that hold securities in which the Large/Mid-Cap Value Fund may directly invest.

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

To meet its investment objective, the Large/Mid-Cap Value Fund typically invests 80% or more of its net assets in U.S. common stocks of large-cap and mid-cap companies.