Shareholder Report, Line Graph (Details) - USD ($) |
12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Feb. 28, 2025 |
Feb. 29, 2024 |
Feb. 28, 2023 |
Feb. 28, 2022 |
Feb. 28, 2021 |
Feb. 29, 2020 |
Feb. 28, 2019 |
Feb. 28, 2018 |
Feb. 28, 2017 |
Feb. 29, 2016 |
Feb. 28, 2015 |
|
| C000029067 | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | CM Advisors Fixed Income Fund | ||||||||||
| Account Value | $ 12,878 | $ 12,174 | $ 11,020 | $ 11,296 | $ 11,165 | $ 10,955 | $ 10,724 | $ 10,666 | $ 10,620 | $ 9,838 | $ 10,000 |
| Bloomberg U.S. Aggregate Bond Index | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index | ||||||||||
| Account Value | $ 11,613 | $ 10,976 | $ 10,622 | $ 11,766 | $ 12,086 | $ 11,921 | $ 10,674 | $ 10,346 | $ 10,294 | $ 10,150 | $ 10,000 |