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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Feb. 28, 2019
Entity Registrant Name dei_EntityRegistrantName CM ADVISORS FAMILY OF FUNDS
Entity Central Index Key dei_EntityCentralIndexKey 0001208252
Amendment Flag dei_AmendmentFlag false
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Document Creation Date dei_DocumentCreationDate Jun. 27, 2019
Document Effective Date dei_DocumentEffectiveDate Jun. 28, 2019
Prospectus Date rr_ProspectusDate Jun. 28, 2019
CM Advisors Small Cap Value Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading CM ADVISORS SMALL CAP VALUE FUND   Fund Summary
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The investment objective of the CM Advisors Small Cap Value Fund (the "Small Cap Value Fund") is long-term growth of capital.
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 Small Cap Value 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 July 1, 2020
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Small Cap Value 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 shares of the Small Cap Value Fund are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Small Cap Value Fund's performance. During the most recent fiscal year, the Small Cap Value Fund's portfolio turnover rate was 31% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 31.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees "Total Annual Fund Operating Expenses" and "Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements" will not correlate to the ratios of expenses to average net assets in the Small Cap Value Fund's Financial Highlights, which reflect the operating expenses of the Small Cap Value Fund and do not include "Acquired Fund Fees and Expenses."
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 Small Cap Value Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Small Cap Value 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, that the Small Cap Value Fund's operating expenses remain the same and that the contractual agreement to waive management fees and reimburse other Small Cap Value Fund expenses remains in effect only until July 1, 2020. 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 SMALL CAP VALUE FUND
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

To meet its investment objective, the Small Cap Value Fund invests primarily in equity securities of small capitalization companies ("small cap") that the Advisor believes are undervalued. Under normal circumstances, at least 80% of the Small Cap Value Fund's net assets (including the amount of any borrowings for investment purposes) will be invested in small cap equity securities, which may include shares of other registered investment companies ("RICs"), such as exchange traded funds ("ETFs"), that invest primarily in small cap equity securities. Small Cap Value Fund shareholders will be provided with at least 60 days' prior notice of any change in the foregoing policy.

 

In managing the Small Cap Value Fund, the Advisor seeks to provide a consistent positive return over the long-term. The Advisor will focus on allocating the assets of the Small Cap Value Fund to those securities and sectors the Advisor believes are best suited to provide positive returns rather than focus on any particular individual security or sector weighting simply because a particular index is modeled a particular way. The Small Cap Value Fund considers a small cap company to be one that has a market capitalization, measured at the time the Fund purchases the securities, not exceeding the greater of (i) $2.5 billion or (ii) the capitalization of the largest company by market cap as reported by the Russell 2000 Value Index (as reported by the index as of the most recent quarter-end). The Russell 2000 Value Index is a broad index of small capitalization stocks. As of May 31, 2019, the capitalization of the largest company by market cap in the Russell 2000 Value Index was $6.6 billion. The market capitalization of a company in the Small Cap Value Fund's portfolio may change over time, and the Fund will not automatically sell or cease to purchase stock of a company it already owns just because the company's market capitalization increases above this ceiling.

 

The Small Cap Value Fund typically invests in common stocks, although it may also invest in other equity securities (e.g., preferred stocks, convertible bonds, convertible preferred stocks, warrants and other RICs). In addition, the Small Cap Value Fund retains the flexibility to invest up to 20% of its net assets in other equity securities (including stock of medium or large capitalization companies), fixed income securities (e.g., corporate bonds or U.S. Government securities) or cash or cash equivalents (e.g., money market funds, short-term U.S. Government obligations, commercial paper, and repurchase agreements) when the Advisor believes they offer more attractive opportunities. The Small Cap Value Fund may purchase fixed income securities of any maturity or yield, provided that corporate debt obligations shall primarily be "investment grade" securities rated in one of the four highest rating categories by any nationally recognized statistical rating organization or, if not so rated, will be of equivalent quality in the opinion of the Advisor. The Small Cap Value Fund may also purchase fixed income securities in any sector and issued by any size company, municipality or government body.

 

In selecting equity securities for the Small Cap Value Fund's portfolio, the Advisor:

 

  ● Applies research models to determine a company's intrinsic value. Intrinsic value is a concept that refers to what a company is "really" worth. Investment advisors that use intrinsic value (like the Advisor) believe that a company's real value can be best determined by analyzing business, financial, and other factors about the company and its market, and that a company's market price gravitates toward its intrinsic value over time. Accordingly, if the market price of the company's securities is above the Advisor's determination of its intrinsic value, the Advisor believes that the market price will, over time, fall. If the market price is below its intrinsic value, then the Advisor believes it will, over time, rise;

 

  ● Compares the company's intrinsic value to the market prices of the company's securities; and

 

  ● Seeks to purchase equity securities of companies that appear to be "bargains" (i.e., securities that are trading at a significant discount to their intrinsic value).

 

In an effort to determine a company's intrinsic value, the Advisor's research models utilize various quantitative, qualitative, fundamental, and other factors about a company and its business. This information can include, without limitation, historical analysis, acquisition analysis, discounted free cash flow models and leveraged buyout models. The Advisor also monitors acquisition prices for companies in various industries, and may communicate with companies, their suppliers and customers as part of its research process. Because a company's business, financial, and market circumstances are always changing, the Advisor evaluates intrinsic value for companies in and out of its portfolio on a regular basis.

 

The Small Cap Value Fund may invest in equity securities of companies in any sector and the securities may be traded on a national securities exchange or over-the-counter. At times, the Small Cap Value Fund may hold a significant portion of its assets in cash or cash equivalent positions for extended periods of time while the Advisor waits for the securities markets to offer more attractive opportunities.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS OF INVESTING IN THE SMALL CAP VALUE FUND
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

All investments carry risks, and an investment in the Small Cap Value Fund is no exception. No investment strategy works all of the time, and past performance is not necessarily indicative of future performance. You may lose money on your investment in the Small Cap Value Fund. To help you understand the risks of investing in the Small Cap Value Fund, the principal risks of an investment in the Small Cap Value Fund are generally described below:

 

  ● Market Risk – Stock prices are volatile. Market risk refers to the risk that the value of securities in the Small Cap Value Fund's portfolio may decline due to daily fluctuations in the securities markets generally. The Small Cap Value Fund's share price will change daily based on many factors that may generally affect the stock market, including fluctuations in interest rates, national and international economic conditions, and general equity market conditions. In a declining stock market, stock prices for all companies (including those in the Small Cap Value Fund's portfolio) may decline, regardless of their long-term prospects. During periods of market volatility, stock prices can change drastically and rapidly, and you could lose money over short or long term periods.

 

  ● Small Cap Risk – Stocks of small cap companies generally have more risks than those of larger companies. This greater risk is, in part, attributable to the fact that small cap companies may have less experienced management teams, serve smaller markets, and find it more difficult to obtain financing for growth or potential development than larger companies. Because small cap companies normally have fewer shares outstanding than larger companies, it may be more difficult to buy or sell significant amounts of such shares without an unfavorable impact on prevailing prices. In addition, small cap companies may not be well-known to the investing public, may not be followed by the financial press or industry analysts, and may not have institutional ownership. These factors affect the Advisor's access to information about the companies and the stability of the markets for the companies' securities. Due to these and other factors, small cap companies may be more susceptible to market downturns, and their stock prices may be more volatile and less liquid than those of larger companies. In addition, the market for small cap securities may be more limited than the market for larger companies.

 

  ● Management Style Risk – Different styles of management tend to shift into and out of favor with stock market investors depending on market and economic conditions. Because the Small Cap Value Fund intends to invest primarily in value-oriented stocks (stocks that the Advisor believes are undervalued), the Small Cap Value Fund's performance may at times be better or worse than the performance of stock funds that focus on other types of stocks (e.g., "growth" stocks selected for growth potential), or that have a broader investment style.

 

  ● Interest Rate Risk – Increases in interest rates typically lower the present value of a company's future earnings stream. Since the market price of a stock changes continuously based upon investors' collective perceptions of future earnings, stock prices will generally decline when investors anticipate or experience rising interest rates. In addition, to the extent the Small Cap Value Fund invests in fixed income securities, the Small Cap Value Fund will be subject to the risk that, in general, prices of fixed income securities will decline when interest rates rise. These fluctuations in fixed income security prices will be more marked with respect to long-term bonds than with respect to short-term bonds and with respect to lower-rated securities than with respect to higher-rated securities. In addition, the prices of lower coupon bonds are generally more volatile than higher coupon bonds of the same approximate maturity and credit quality. The Small Cap Value Fund may be subject to a greater risk of rising interest rates due to the current period of historically low interest rates and the potential for a general rise in interest rates in the future.

 

  ● Liquidity Risk – Liquidity risk is the risk that a particular investment cannot be sold at an advantageous time or price. For example, if a fixed income security is downgraded or drops in price, the market demand for that security may be limited, making that security difficult to sell. Additionally, the market for certain securities may become illiquid under adverse market or economic conditions, independent of any specific adverse changes in the conditions of a particular issuer.

 

  ● Credit Risk – The Small Cap Value Fund's fixed income securities will be subject to credit risks. Issuers of fixed income securities who are experiencing difficult economic circumstances, either because of a general economic downturn or individual circumstances, may be unable to make interest payments on their fixed income securities when due. Additionally, issuers of fixed income securities may be unable to repay the principal upon maturity of such securities. These "credit risks" are reflected in the credit ratings assigned to fixed income securities by organizations such as Moody's Investor Service, Inc. ("Moody's"), S&P Global Ratings ("S&P") or Fitch Ratings, Inc. ("Fitch") and may cause the price of a fixed income security to decline and may affect liquidity for the security. Normally, fixed income securities with lower credit ratings will have higher yields than fixed income securities with the highest credit ratings, reflecting the relatively greater risk of fixed income securities with lower credit ratings.

 

  ● Maturity Risk – Maturity risk is another factor that can affect the value of the Small Cap Value Fund's fixed income security holdings. In general, but not in all cases, the longer the maturity of a fixed income security, the higher its yield and the greater its price sensitivity to changes in interest rates. Conversely, the shorter the maturity, the lower the yield but the greater the price stability. The Small Cap Value Fund will be subject to greater maturity risk to the extent it is invested in fixed income securities with longer maturities. This risk may be heightened given the current historically low interest rate environment and the potentially higher rates in the future.

 

  ● Business and Sector Risk – To the extent the Small Cap Value Fund has significant investments in the securities of issuers in industries within a particular sector, any development affecting that sector will have a greater impact on the value of the net assets of the Small Cap Value Fund than would be the case if the Small Cap Value Fund did not have significant investments in that sector. In addition, this may increase the risk of loss of an investment in the Small Cap Value Fund and increase the volatility of the Small Cap Value Fund's net asset value per share. From time to time, a particular set of circumstances may affect a sector or certain companies within that sector, while having little or no impact on other sectors or other companies within the sector. For instance, economic or market factors, regulation or deregulation, and technological or other developments may negatively impact all companies in a particular sector or certain companies within a particular sector and therefore the value of the Small Cap Value Fund's portfolio will be adversely affected.

 

  ● Risks Related to Other Equity Securities – In addition to common stocks, the equity securities in the Small Cap Value Fund's portfolio may include preferred stocks, convertible preferred stocks, convertible bonds, and warrants. Like common stocks, the value of these equity securities may fluctuate in response to many factors, including the activities of the issuer, general market and economic conditions, interest rates, and specific industry changes. Also, regardless of any one company's particular prospects, a declining stock market may produce a decline in prices for all equity securities, which could also result in losses for the Small Cap Value Fund. Convertible securities entitle the holder to receive interest payments or a dividend preference until the security matures, is redeemed, or the conversion feature is exercised. As a result of the conversion feature, the interest rate or dividend preference is generally less than if the securities were non-convertible. Warrants entitle the holder to purchase equity securities at specific prices for a certain period of time. The prices do not necessarily move parallel to the prices of the underlying securities and the warrants have no voting rights, receive no dividends, and have no rights with respect to the assets of the issuer.

 

  ● Risks of Investments in Other RICs – To the extent that it invests in other RICs, the Small Cap Value Fund incurs greater expenses, such as its own management fees and other operating expenses, than an investor would incur who invested directly in the RICs. The Small Cap Value Fund's investments in other RICs are subject to all of the underlying risks of such RICs. These include such general risks as market risk and management risk. In addition to these risks, the Small Cap Value Fund's investment in a closed-end fund or ETF is subject to the risk that the closed-end fund or ETF may trade at prices significantly different from its net asset value. Investments in a closed-end fund may be subject to liquidity risk (that is, the potential that the Fund may be unable to dispose of the closed-end fund shares promptly or at a reasonable price).
Risk Lose Money [Text] rr_RiskLoseMoney You may lose money on your investment in the Small Cap Value Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PERFORMANCE SUMMARY
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and table that follow provide some indication of the risks of investing in the Small Cap Value Fund by showing changes in the Small Cap Value Fund's performance from year to year and by showing how the Small Cap Value Fund's average annual returns for 1 year, 5 year, and since inception compare with those of a broad-based securities market index. How the Small Cap Value Fund has performed in the past (before and after taxes) is not necessarily an indication of how the Small Cap Value Fund will perform in the future. Updated performance information, current to the most recent month end, is available by calling 1-888-859-5856.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table that follow provide some indication of the risks of investing in the Small Cap Value Fund by showing changes in the Small Cap Value Fund's performance from year to year and by showing how the Small Cap Value Fund's average annual returns for 1 year, 5 year, and since inception compare with those of a broad-based securities market index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-888-859-5856
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture How the Small Cap Value Fund has performed in the past (before and after taxes) is not necessarily an indication of how the Small Cap Value Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading CM Advisors Small Cap Value Fund Calendar Year Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

The Small Cap Value Fund's year-to-date return through March 31, 2019 is 16.59%.

 

Quarterly Returns During This Time Period

 

Highest: 19.85% (quarter ended December 31, 2016)
Lowest: -31.32% (quarter ended December 31, 2018)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns for Periods Ended December 31, 2018
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 After-tax returns shown are not relevant to investors who hold their Small Cap Value Fund shares through tax-deferred arrangements, such as a 401(k) plan or an individual retirement account (IRA).
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss on the sale of Fund shares.
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. After-tax returns shown are not relevant to investors who hold their Small Cap Value Fund shares through tax-deferred arrangements, such as a 401(k) plan or an individual retirement account (IRA). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss on the sale of Fund shares.
CM Advisors Small Cap Value Fund | CM Advisors Small Cap Value Fund Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol CMOVX
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a % of the amount redeemed within 180 days after purchase) rr_RedemptionFeeOverRedemption (1.00%)
Exchange Fee rr_ExchangeFee none
Management Fees rr_ManagementFeesOverAssets 0.85% [1]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.50%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.37% [1],[2]
Fee Waivers and Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.10%) [3]
Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements rr_NetExpensesOverAssets 1.27% [1],[2]
One Year rr_ExpenseExampleYear01 $ 127
Three Years rr_ExpenseExampleYear03 422
Five Years rr_ExpenseExampleYear05 739
Ten Years rr_ExpenseExampleYear10 $ 1,636
Annual Return 2012 rr_AnnualReturn2012 18.50%
Annual Return 2013 rr_AnnualReturn2013 26.64%
Annual Return 2014 rr_AnnualReturn2014 (9.20%)
Annual Return 2015 rr_AnnualReturn2015 (27.16%)
Annual Return 2016 rr_AnnualReturn2016 57.22%
Annual Return 2017 rr_AnnualReturn2017 (1.41%)
Annual Return 2018 rr_AnnualReturn2018 (23.27%)
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2019
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 16.59%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2016
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.85%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (31.32%)
1 Year rr_AverageAnnualReturnYear01 (23.27%)
5 Years rr_AverageAnnualReturnYear05 (4.69%)
Since Inception rr_AverageAnnualReturnSinceInception 0.93%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 15, 2011
CM Advisors Small Cap Value Fund | After Taxes on Distributions | CM Advisors Small Cap Value Fund Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (23.27%)
5 Years rr_AverageAnnualReturnYear05 (5.04%)
Since Inception rr_AverageAnnualReturnSinceInception 1.43%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 15, 2011
CM Advisors Small Cap Value Fund | After Taxes on Distributions and Sales | CM Advisors Small Cap Value Fund Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (13.78%)
5 Years rr_AverageAnnualReturnYear05 (3.47%)
Since Inception rr_AverageAnnualReturnSinceInception 0.77%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 15, 2011
CM Advisors Small Cap Value Fund | Russell 2000® Value Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (12.86%)
5 Years rr_AverageAnnualReturnYear05 3.61%
Since Inception rr_AverageAnnualReturnSinceInception 7.18%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 15, 2011
CM Advisors Fixed Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading CM ADVISORS FIXED INCOME FUND   Fund Summary
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The investment objective of the CM Advisors Fixed Income Fund (the "Fixed Income Fund") is to seek to preserve capital and maximize total return.
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 Fixed Income 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 Fixed Income 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 Fixed Income 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 Fixed Income Fund's performance. During the most recent fiscal year, the Fixed Income Fund's portfolio turnover rate was 28% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 28.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees "Total Annual Fund Operating Expenses" will not correlate to the ratios of expenses to average net assets in the Fixed Income Fund's Financial Highlights, which reflect the operating expenses of the Fixed Income Fund and do not include "Acquired Fund Fees and Expenses."
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 Fixed Income Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fixed Income 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 Fixed Income Fund's operating expenses remain the same. 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 FIXED INCOME FUND
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

To meet its investment objective, the Fixed Income Fund invests primarily in U.S. dollar denominated fixed income securities that the Advisor believes are undervalued. The Fixed Income Fund may invest in all types of fixed income securities but will typically invest in fixed income securities such as corporate bonds, U.S. government securities and mortgage-backed securities. Under normal circumstances, at least 80% of the Fixed Income Fund's net assets (including the amount of any borrowings for investment purposes) will be invested in fixed income investments, which include fixed income securities and shares of other RICs that invest primarily in fixed income securities. Fixed Income Fund shareholders will be provided with at least 60 days' prior notice of any change in the foregoing policy.

 

While the Advisor considers potential income from fixed income securities (interest payments to be made on bonds and notes) when evaluating possible investments for the Fixed Income Fund, the Advisor's primary criteria for fixed income securities relates to their appreciation potential. In selecting fixed income securities for the Fixed Income Fund, the Advisor generally:

 

  ● Reviews the maturity, yield, and ratings from nationally recognized statistical rating organizations (e.g., S&P, Moody's and Fitch) of a fixed income security, both independently and in relation to the Fixed Income Fund's current portfolio;

 

  ● Analyzes the current and projected financial and economic conditions of the issuer and the market for its securities using proprietary research models; and

 

  ● Seeks to purchase fixed income securities that the Advisor believes (i) fit the desired mix of fixed income securities for the portfolio (e.g., the types of securities, maturities and yields then targeted for the Fixed Income Fund); and (ii) offer opportunities for price appreciation.

 

The Fixed Income Fund may, without limitation, purchase fixed income securities of any credit quality, maturity, or yield. Accordingly, the Fixed Income Fund may hold fixed income securities that receive the highest ratings from Moody's, S&P, Fitch or a similar rating agency, and fixed income securities that receive lower or the lowest ratings. There is no limitation on the number or amount of lower-rated fixed income securities, such as high-yield or junk bonds, that the Fixed Income Fund may purchase. The Fixed Income Fund may also, without limitation, purchase fixed income securities in any sector and issued by any size company, municipality or government body.

 

While the Fixed Income Fund's primary focus is investing in fixed income securities, the Fixed Income Fund may invest in cash or cash equivalent positions (e.g., money market funds, short-term U.S. Government obligations, commercial paper, and repurchase agreements) when the Advisor believes the fixed income securities markets offer limited investment opportunity or are overpriced. At times the Fixed Income Fund may hold a significant portion of its assets in cash or cash equivalent positions for extended periods of time while the Advisor waits for the fixed income securities markets to offer more attractive opportunities.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS OF INVESTING IN THE FIXED INCOME FUND
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

All investments carry risks, and an investment in the Fixed Income Fund is no exception. No investment strategy works all of the time, and past performance is not necessarily indicative of future performance. You may lose money on your investment in the Fixed Income Fund. To help you understand the risks of investing in the Fixed Income Fund, the principal risks of an investment in the Fixed Income Fund are generally described below:

 

  ● Market Risk – Market risk refers to the risk that the value of securities in the Fixed Income Fund's portfolio may decline due to daily fluctuations in the securities markets generally. The Fixed Income Fund's performance per share will change daily based on many factors, including fluctuation in interest rates, the quality of the instruments in the Fixed Income Fund's investment portfolio, national and international economic conditions and general fixed income market conditions. During periods of market volatility, stock prices can change drastically and rapidly, and you could lose money over short or long term periods.

 

  ● Income Risk – One of the Fixed Income Fund's primary sources of income will be derived from the receipt of interest payments from fixed income securities. An economic downturn or an increase in interest rates may have a negative or adverse effect on an issuer's ability to timely make payments of principal and interest. If the issuer fails to make timely interest and/or principal payments, then the Fixed Income Fund's current income will be adversely affected and reduced.

 

  ● Interest Rate Risk – The price of a fixed income security is dependent upon interest rates. The share price and total return of the Fixed Income Fund, when investing a significant portion of its assets in fixed income securities, will vary in response to changes in interest rates. A rise in interest rates will cause the value of fixed income securities to decrease. Conversely, a decrease in interest rates will cause the value of fixed income securities to increase. Consequently, changes in interest rates may have a significant effect on the Fixed Income Fund, including greater fluctuation in the Fixed Income Fund's share price, especially if the Fixed Income Fund is holding a significant portion of its assets in fixed income securities that are particularly sensitive to interest rate fluctuations, such as fixed income securities with long-term maturities, zero coupon bonds, and debentures. The Fixed Income Fund may be subject to a greater risk of rising interest rates due to the current period of historically low interest rates and the potential for a general rise in interest rates in the future.

 

  ● Liquidity Risk – Liquidity risk is the risk that a particular investment cannot be sold at an advantageous time or price. For example, if a fixed income security is downgraded or drops in price, the market demand for that security may be limited, making that security difficult to sell. Additionally, the market for certain securities may become illiquid under adverse market or economic conditions, independent of any specific adverse changes in the conditions of a particular issuer. Investments in fixed income securities, including below investment grade securities, tend to involve greater liquidity risk.

 

  ● Credit Risk – Credit risk is the risk that the issuer of a fixed income security (including corporate, government and mortgage-backed securities) will be unable or unwilling to make timely principal and/or interest payments, or otherwise will be unable or unwilling to honor its financial obligations. If the issuer fails to pay interest, the Fixed Income Fund's income will be reduced. If the issuer fails to repay principal, the value of that security and of the Fixed Income Fund's shares may be reduced. To the extent the Fixed Income Fund invests in lower rated fixed income securities, the Fixed Income Fund will be subject to a higher level of credit risk than a fund that invests only in the highest rated fixed income securities.

 

    Corporate and municipal fixed income securities purchased by the Fixed Income Fund may be of any credit quality, maturity or yield. Accordingly, the Fixed Income Fund's fixed income securities may include "investment grade" securities (those rated at least Baa by Moody's, BBB by S&P or Fitch or, if not rated, of equivalent quality in the Advisor's opinion). However, the Fixed Income Fund's fixed income securities may also include lower-rated securities including, without limitation, high-yield securities ("junk bonds") rated below Baa by Moody's or BBB by S&P or Fitch (see "Junk Bonds or Lower-Rated Securities Risk" below). The Fixed Income Fund's fixed income security investments are subject to risks of non-payment of interest and principal, the risk that bond demand in the marketplace will decrease periodically, and the risk that ratings of the various credit services (and the Advisor's independent assessments of the securities creditworthiness) are or may become inaccurate.

 

  ● Junk Bonds or Lower-Rated Securities Risk – Fixed income securities rated below Baa by Moody's and BBB by S&P or Fitch are generally considered speculative in nature and are generally subject to greater risks with respect to the non-payment of interest and principal and greater market fluctuations than higher-rated fixed income securities. Lower-rated fixed income securities are usually issued by companies without long track records of sales and earnings, or by companies with questionable credit strength. These fixed income securities are considered below "investment-grade." The retail secondary market for these "junk bonds" may be less liquid than that of higher-rated fixed income securities, and adverse conditions could make it difficult at times to sell certain securities or could result in lower prices than those used in calculating the Fixed Income Fund's net asset value. These risks can reduce the value of the Fixed Income Fund's shares and the income it earns.

 

  ● Maturity Risk – Maturity risk is another factor that can affect the value of the Fixed Income Fund's fixed income security holdings. In general, but not in all cases, the longer the maturity of a fixed income security, the higher its yield and the greater its price sensitivity to changes in interest rates. Conversely, the shorter the maturity, the lower the yield but the greater the price stability. The Fixed Income Fund will be subject to greater maturity risk to the extent it is invested in fixed income securities with longer maturities. This risk may be heightened given the current historically low interest rate environment and the potentially higher rates in the future.

 

  ● Management Style Risk – The share price of the Fixed Income Fund changes daily based on the performance of the securities in which it invests. The ability of the Fixed Income Fund to meet its investment objective is directly related to the Advisor's allocation of the Fixed Income Fund's assets and selection of securities. The Advisor's judgments about the attractiveness, value, and potential income and appreciation of particular fixed income securities, cash or cash equivalents or other securities in which the Fixed Income Fund invests may prove to be incorrect and there is no assurance that the Advisor's judgment will produce the desired results. In addition, the Fixed Income Fund may allocate its assets so as to under-emphasize or over-emphasize fixed income securities, cash or cash equivalents, or other investments under the wrong market conditions, in which case the value of the Fixed Income Fund's portfolio may be adversely affected.

 

  ● Mortgage Risk – Because rising interest rates reduce the tendency of mortgage borrowers to prepay or refinance their loans, rising interest rates tend to increase the effective maturity of mortgage-related securities, resulting in greater losses when interest rates rise. This is known as extension risk. Conversely, falling interest rates may encourage borrowers to pay off or refinance their mortgages sooner than expected. This can reduce the effective maturity of mortgage-related securities and lower the returns of the Fixed Income Fund because the Fixed Income Fund will have to reinvest its assets at the lower prevailing interest rates. This is known as prepayment risk.

 

  ● Regional and Sector Risk – Regional and sector risk is the risk that if the Fixed Income Fund invests heavily in securities within the same country, state, region, currency, industry or economic sector, an adverse economic, business or political development may affect the value of the Fixed Income Fund's investments more than if its investments were not so focused. To the extent the Fixed Income Fund invests heavily in securities in any such area that experiences an adverse development, the value of the Fixed Income Fund's portfolio may be negatively affected.

 

  ● U.S. Government Obligations Risk – Securities issued by the U.S. government or its agencies are subject to risks related to the creditworthiness of the U.S. government. In addition, such securities may be not be backed by the "full faith and credit" of the U.S. government, but rather by a right to borrow from the U.S. government or the creditworthiness of the issuer itself. The value of any such securities may fluctuate with changes in credit ratings and market perceptions of the U.S. government and the issuers of the securities, as well as interest rates and other risks applicable to fixed income securities generally.

 

  ● Risks of Investments in Other RICs – To the extent that it invests in other RICs, the Fixed Income Fund incurs greater expenses, such as its own management fees and other operating expenses, than an investor would incur who invested directly in the RICs. The Fixed Income Fund's investments in other RICs are subject to all of the underlying risks of such RICs. These include such general risks as market risk and management risk. In addition to these risks, the Fixed Income Fund's investment in a closed-end fund or ETF is subject to the risk that the closed-end fund or ETF may trade at prices significantly different from its net asset value. Investments in a closed-end fund may be subject to liquidity risk (that is, the potential that the fund may be unable to dispose of the closed-end fund shares promptly or at a reasonable price).
Risk Lose Money [Text] rr_RiskLoseMoney You may lose money on your investment in the Fixed Income Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PERFORMANCE SUMMARY
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and table that follow provide some indication of the risks of investing in the Fixed Income Fund by showing changes in the Fixed Income Fund's performance from year to year and by showing how the Fixed Income Fund's average annual total returns for 1, 5 and 10 years compare with those of a broad-based securities market index. How the Fixed Income Fund has performed in the past (before and after taxes) is not necessarily an indication of how the Fixed Income Fund will perform in the future. Updated performance information, current to the most recent month end, is available by calling 1-888-859-5856.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table that follow provide some indication of the risks of investing in the Fixed Income Fund by showing changes in the Fixed Income Fund's performance from year to year and by showing how the Fixed Income Fund's average annual total returns for 1, 5 and 10 years compare with those of a broad-based securities market index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-888-859-5856
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture How the Fixed Income Fund has performed in the past (before and after taxes) is not necessarily an indication of how the Fixed Income Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading CM Advisors Fixed Income Fund Calendar Year Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

The Fixed Income Fund's year-to-date return through March 31, 2019 is 2.19%.

 

Quarterly Returns During This Time Period

 

Highest: 7.14% (quarter ended June 30, 2009)
Lowest: -1.88% (quarter ended December 31, 2018)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns for Periods Ended December 31, 2018
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 After-tax returns shown are not relevant to investors who hold their Fixed Income Fund shares through tax-deferred arrangements, such as a 401(k) plan or an individual retirement account (IRA).
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss on the sale of Fund shares.
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. After-tax returns shown are not relevant to investors who hold their Fixed Income Fund shares through tax-deferred arrangements, such as a 401(k) plan or an individual retirement account (IRA). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss on the sale of Fund shares.
CM Advisors Fixed Income Fund | CM Advisors Fixed Income Fund Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol CMFIX
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a % of the amount redeemed within 180 days after purchase) rr_RedemptionFeeOverRedemption none
Exchange Fee rr_ExchangeFee none
Management Fees rr_ManagementFeesOverAssets 0.50%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.40%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.92% [4]
One Year rr_ExpenseExampleYear01 $ 94
Three Years rr_ExpenseExampleYear03 293
Five Years rr_ExpenseExampleYear05 509
Ten Years rr_ExpenseExampleYear10 $ 1,131
Annual Return 2009 rr_AnnualReturn2009 13.29%
Annual Return 2010 rr_AnnualReturn2010 7.93%
Annual Return 2011 rr_AnnualReturn2011 6.11%
Annual Return 2012 rr_AnnualReturn2012 2.52%
Annual Return 2013 rr_AnnualReturn2013 0.01%
Annual Return 2014 rr_AnnualReturn2014 1.59%
Annual Return 2015 rr_AnnualReturn2015 (1.37%)
Annual Return 2016 rr_AnnualReturn2016 6.93%
Annual Return 2017 rr_AnnualReturn2017 2.30%
Annual Return 2018 rr_AnnualReturn2018 (1.63%)
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2019
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 2.19%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 7.14%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (1.88%)
1 Year rr_AverageAnnualReturnYear01 (1.63%)
5 Years rr_AverageAnnualReturnYear05 1.52%
10 Years rr_AverageAnnualReturnYear10 3.67%
CM Advisors Fixed Income Fund | After Taxes on Distributions | CM Advisors Fixed Income Fund Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (2.84%)
5 Years rr_AverageAnnualReturnYear05 0.40%
10 Years rr_AverageAnnualReturnYear10 2.59%
CM Advisors Fixed Income Fund | After Taxes on Distributions and Sales | CM Advisors Fixed Income Fund Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (0.87%)
5 Years rr_AverageAnnualReturnYear05 0.72%
10 Years rr_AverageAnnualReturnYear10 2.47%
CM Advisors Fixed Income Fund | Bloomberg Barclays US Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 0.01%
5 Years rr_AverageAnnualReturnYear05 2.52%
10 Years rr_AverageAnnualReturnYear10 3.48%
[1] "Management Fees" and "Total Annual Fund Operating Expenses" reflect a contractual reduction in the Management Fee due to the Advisor from 1.00% to 0.85% of the Small Cap Value Fund's average daily net assets, effective March 1, 2019.
[2] "Total Annual Fund Operating Expenses" and "Total Annual Fund Operating Expenses After Fee Waivers and Expense Reimbursements" will not correlate to the ratios of expenses to average net assets in the Small Cap Value Fund's Financial Highlights, which reflect the operating expenses of the Small Cap Value Fund and do not include "Acquired Fund Fees and Expenses."
[3] The Advisor has entered into an Expense Limitation Agreement with the Small Cap Value Fund under which it has agreed until July 1, 2020 to waive its fees and to reimburse other expenses of the Small Cap Value Fund, if necessary, in an amount that limits the Small Cap Value Fund's annual operating expenses (exclusive of interest, taxes, brokerage commissions, other expenditures which are capitalized in accordance with generally accepted accounting principles, other extraordinary expenses not incurred in the ordinary course of the Fund's business, dividend expense on securities sold short, Acquired Fund Fees and Expenses, and amounts, if any, under a Rule 12b-1 Plan) to not more than 1.25% of its average daily net assets. The Expense Limitation Agreement cannot be terminated prior to July 1, 2020 without the approval of the Board of Trustees (the "Board") of the CM Advisors Family of Funds (the "Trust").
[4] "Total Annual Fund Operating Expenses" will not correlate to the ratios of expenses to average net assets in the Fixed Income Fund's Financial Highlights, which reflect the operating expenses of the Fixed Income Fund and do not include "Acquired Fund Fees and Expenses."