Shareholder Report, Line Graph (Details) - USD ($) |
12 Months Ended | 24 Months Ended | 36 Months Ended | 48 Months Ended | 60 Months Ended | 72 Months Ended | 84 Months Ended | 96 Months Ended | 108 Months Ended | 120 Months Ended | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Feb. 29, 2016 |
Feb. 28, 2026 |
Feb. 28, 2017 |
Feb. 28, 2018 |
Feb. 28, 2019 |
Feb. 29, 2020 |
Feb. 28, 2021 |
Feb. 28, 2022 |
Feb. 28, 2023 |
Feb. 29, 2024 |
Feb. 28, 2025 |
Feb. 28, 2026 |
|
| C000029067 | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | CM Advisors Fixed Income Fund | |||||||||||
| Accumulated Value | $ 10,000 | $ 10,795 | $ 10,842 | $ 10,901 | $ 11,135 | $ 11,349 | $ 11,482 | $ 11,201 | $ 12,374 | $ 13,090 | $ 14,318 | |
| Bloomberg U.S. Aggregate Bond Index | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index | |||||||||||
| Accumulated Value | $ 10,000 | $ 10,142 | $ 10,193 | $ 10,516 | $ 11,744 | $ 11,907 | $ 11,592 | $ 10,465 | $ 10,813 | $ 11,441 | $ 12,158 | |