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Note 8 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Stock-based compensation expense, gross |  | $ | 20 |  |  | $ | 22 |  |  | $ | 14 |
Income tax benefit at our statutory rate associated with stock-based compensation |  |  | (5 | ) |  |  | (6 | ) |  |  | (4 | )
Stock-based compensation expense, net |  | $ | 15 |  |  | $ | 16 |  |  | $ | 10 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
|  |  |  |  |  | Weighted- |  |  |  |  |  |  | Weighted- |  |  |  |  |  |  | Weighted- |
|  |  |  |  |  | Average |  |  |  |  |  |  | Average |  |  |  |  |  |  | Average |
|  | Number |  |  | Grant Date |  |  | Number |  |  | Grant Date |  |  | Number |  |  | Grant Date |
|  | of |  |  | Fair Value |  |  | of |  |  | Fair Value |  |  | of |  |  | Fair Value |
|  | Shares |  |  | Per Share |  |  | Shares |  |  | Per Share |  |  | Shares |  |  | Per Share |
Restricted stock - common: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 997,745 |  |  | $ | 20.62 |  |  |  | 1,035,728 |  |  | $ | 19.69 |  |  |  | 917,533 |  |  | $ | 16.84 |
Granted |  |  | 1,007,919 |  |  |  | 8.15 |  |  |  | 400,927 |  |  |  | 21.68 |  |  |  | 731,374 |  |  |  | 19.73 |
Vested |  |  | (537,728 | ) |  |  | 20.32 |  |  |  | (438,910 | ) |  |  | 19.38 |  |  |  | (613,179 | ) |  |  | 15.48 |
Outstanding - end of period |  |  | 1,467,936 |  |  | $ | 12.17 |  |  |  | 997,745 |  |  | $ | 20.62 |  |  |  | 1,035,728 |  |  | $ | 19.69 |
Restricted stock - Class A common: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 677,238 |  |  | $ | 19.36 |  |  |  | 720,421 |  |  | $ | 18.22 |  |  |  | 480,042 |  |  | $ | 16.10 |
Granted |  |  | 738,854 |  |  |  | 8.34 |  |  |  | 250,448 |  |  |  | 20.52 |  |  |  | 488,918 |  |  |  | 18.66 |
Vested |  |  | (267,859 | ) |  |  | 18.95 |  |  |  | (293,631 | ) |  |  | 17.55 |  |  |  | (248,539 | ) |  |  | 15.00 |
Outstanding - end of period |  |  | 1,148,233 |  |  | $ | 12.37 |  |  |  | 677,238 |  |  | $ | 19.36 |  |  |  | 720,421 |  |  | $ | 18.22 |
Restricted stock units - common: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 274,145 |  |  | $ | 23.60 |  |  |  | 125,247 |  |  | $ | 19.02 |  |  |  | 90,184 |  |  | $ | 18.92 |
Granted |  |  | 587,168 |  |  |  | 11.50 |  |  |  | 259,079 |  |  |  | 23.87 |  |  |  | 95,115 |  |  |  | 19.05 |
Vested |  |  | (247,953 | ) |  |  | 23.64 |  |  |  | (108,921 | ) |  |  | 19.03 |  |  |  | (60,052 | ) |  |  | 18.92 |
Forfeited |  |  | (26,192 | ) |  |  | 23.15 |  |  |  | (1,260 | ) |  |  | 19.05 |  |  |  | - |  |  |  | - |
Outstanding - end of period |  |  | 587,168 |  |  | $ | 11.50 |  |  |  | 274,145 |  |  | $ | 23.60 |  |  |  | 125,247 |  |  | $ | 19.02 |

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