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Note 8 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Stock-based compensation expense, gross |  | $ | 16 |  |  | $ | 16 |  |  | $ | 7 |
Income tax benefit at our statutory rate associated with stock-based compensation |  |  | (4 | ) |  |  | (4 | ) |  |  | (2 | )
Stock-based compensation expense, net |  | $ | 12 |  |  | $ | 12 |  |  | $ | 5 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  |  |  |  |  | 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 |  |  | 977,547 |  |  | $ | 15.45 |  |  |  | 578,894 |  |  | $ | 13.14 |  |  |  | 503,685 |  |  | $ | 11.14 |
Granted |  |  | 359,481 |  |  |  | 18.92 |  |  |  | 751,463 |  |  |  | 16.07 |  |  |  | 391,836 |  |  |  | 14.63 |
Vested |  |  | (333,865 | ) |  |  | 15.35 |  |  |  | (352,810 | ) |  |  | 12.98 |  |  |  | (225,570 | ) |  |  | 11.21 |
Forfeited |  |  | (85,630 | ) |  |  | 15.53 |  |  |  | - |  |  |  | - |  |  |  | (91,057 | ) |  |  | 13.27 |
Outstanding - end of period |  |  | 917,533 |  |  | $ | 16.84 |  |  |  | 977,547 |  |  | $ | 15.45 |  |  |  | 578,894 |  |  | $ | 13.14 |
Restricted stock - Class A common: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 449,284 |  |  | $ | 13.55 |  |  |  | 407,786 |  |  | $ | 11.82 |  |  |  | 462,632 |  |  | $ | 10.63 |
Granted |  |  | 166,814 |  |  |  | 19.87 |  |  |  | 199,810 |  |  |  | 15.36 |  |  |  | 220,080 |  |  |  | 12.65 |
Vested |  |  | (136,056 | ) |  |  | 12.32 |  |  |  | (158,312 | ) |  |  | 11.38 |  |  |  | (274,926 | ) |  |  | 10.48 |
Outstanding - end of period |  |  | 480,042 |  |  | $ | 16.10 |  |  |  | 449,284 |  |  | $ | 13.55 |  |  |  | 407,786 |  |  | $ | 11.82 |
Restricted stock units - common: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 398,000 |  |  | $ | 18.21 |  |  |  | - |  |  | $ | - |  |  |  | 209,500 |  |  | $ | 15.70 |
Granted |  |  | 93,184 |  |  |  | 18.77 |  |  |  | 398,000 |  |  |  | 18.21 |  |  |  | - |  |  |  | - |
Vested |  |  | (374,500 | ) |  |  | 18.18 |  |  |  | - |  |  |  | - |  |  |  | (209,500 | ) |  |  | 15.70 |
Forfeited |  |  | (26,500 | ) |  |  | 18.21 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Outstanding - end of period |  |  | 90,184 |  |  | $ | 18.92 |  |  |  | 398,000 |  |  | $ | 18.21 |  |  |  | - |  |  | $ | - |

X
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