Shareholder Report, Average Annual Return (Details) |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Feb. 28, 2026 |
Feb. 28, 2026 |
Feb. 28, 2026 |
|
| 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 | 9.38% | 4.76% | 3.65% |
| 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 | 6.26% | 0.42% | 1.97% |