Shareholder Report, Average Annual Return (Details) |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Feb. 28, 2025 |
Feb. 28, 2025 |
Feb. 28, 2025 |
|
| C000029067 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | CM Advisors Fixed Income Fund | ||
| Without Sales Load [Member] | C000029067 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 5.78% | 3.29% | 2.56% |
| Bloomberg U.S. Aggregate Bond Index | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index | ||
| Average Annual Return, Percent | 5.81% | (0.52%) | 1.51% |