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Note 9 - Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2019
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2019 |  |  | 2018 |
Stock-based compensation expense, gross |  | $ | 2 |  |  | $ | 2 |
Income tax benefit at our statutory rate associated with stock-based compensation |  |  | (1 | ) |  |  | (1 | )
Stock-based compensation expense, net |  | $ | 1 |  |  | $ | 1 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2019 |  |  | 2018 |
|  |  |  |  |  | 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 |  |  | 578,894 |  |  | $ | 13.14 |  |  |  | 503,685 |  |  | $ | 11.14 |
Granted (1) |  |  | 677,602 |  |  |  | 15.72 |  |  |  | 318,196 |  |  |  | 15.25 |
Vested |  |  | (279,170 | ) |  |  | 13.25 |  |  |  | (225,570 | ) |  |  | 11.21 |
Outstanding - end of period |  |  | 977,326 |  |  | $ | 14.89 |  |  |  | 596,311 |  |  | $ | 13.31 |
Restricted Class A common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 407,786 |  |  | $ | 11.82 |  |  |  | 462,632 |  |  | $ | 10.63 |
Granted (1) |  |  | 199,810 |  |  |  | 15.36 |  |  |  | 220,080 |  |  |  | 12.65 |
Vested |  |  | (158,312 | ) |  |  | 11.38 |  |  |  | (274,926 | ) |  |  | 10.48 |
Outstanding - end of period |  |  | 449,284 |  |  | $ | 13.55 |  |  |  | 407,786 |  |  | $ | 11.82 |
Restricted stock units - common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | - |  |  | $ | - |  |  |  | 209,500 |  |  | $ | 15.70 |
Vested |  |  | - |  |  |  | - |  |  |  | (209,500 | ) |  |  | 15.70 |
Outstanding - end of period |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |

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