CM Advisors Fixed Income Fund Market Events And Geopolitical Risk [Member] Income Risk [Member] Interests Rate Risk [Member] Liquidity Risk [Member] Credits Risk [Member] Junk Bonds Or Lower Rated Securities Risk [Member] Maturity Risk [Member] Management Style Risk [Member] Mortgage Risk [Member] Regional And Sector Risk [Member] U S Government Obligations Risk [Member] Risks Of Investments In Other R I Cs [Member] CM Advisors Fixed Income Fund Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses or taxes) CM Advisors Fixed Income Fund [Default Label]