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Note 8 - Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2021
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2021 |  |  | 2020 |
Stock-based compensation expense, gross |  | $ | 4 |  |  | $ | 4 |
Income tax benefit at our statutory rate associated with stock-based compensation |  |  | (1 | ) |  |  | (1 | )
Stock-based compensation expense, net |  | $ | 3 |  |  | $ | 3 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2021 |  |  | 2020 |
|  |  |  |  |  | Weighted- |  |  |  |  |  |  | Weighted- |
|  |  |  |  |  | Average |  |  |  |  |  |  | Average |
|  | Number |  |  | Grant Date |  |  | Number |  |  | Grant Date |
|  | of |  |  | Fair Value |  |  | of |  |  | Fair Value |
|  | Shares |  |  | Per Share |  |  | Shares |  |  | Per Share |
Restricted common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 917,533 |  |  | $ | 16.84 |  |  |  | 977,547 |  |  | $ | 15.45 |
Granted (1) |  |  | 296,042 |  |  |  | 18.21 |  |  |  | 248,543 |  |  |  | 21.69 |
Forfeited |  |  | - |  |  |  | - |  |  |  | (85,630 | ) |  |  | 15.53 |
Vested |  |  | (502,241 | ) |  |  | 16.10 |  |  |  | (260,004 | ) |  |  | 14.20 |
Outstanding - end of period |  |  | 711,334 |  |  | $ | 17.94 |  |  |  | 880,456 |  |  | $ | 17.57 |
Restricted Class A common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 480,042 |  |  | $ | 16.10 |  |  |  | 449,284 |  |  | $ | 13.55 |
Granted (1) |  |  | 233,425 |  |  |  | 17.67 |  |  |  | 166,814 |  |  |  | 19.87 |
Vested |  |  | (248,539 | ) |  |  | 15.00 |  |  |  | (136,056 | ) |  |  | 12.32 |
Outstanding - end of period |  |  | 464,928 |  |  | $ | 17.47 |  |  |  | 480,042 |  |  | $ | 16.10 |
Restricted stock units - common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 90,184 |  |  | $ | 18.92 |  |  |  | 398,000 |  |  | $ | 18.21 |
Granted |  |  | 95,115 |  |  |  | 19.05 |  |  |  | 90,184 |  |  |  | 18.92 |
Vested |  |  | (60,052 | ) |  |  | 18.92 |  |  |  | - |  |  |  | - |
Outstanding - end of period |  |  | 125,247 |  |  | $ | 19.02 |  |  |  | 488,184 |  |  | $ | 18.34 |

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