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Note 7 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Stock-based compensation expense, gross |  | $ | 6,661 |  |  | $ | 8,303 |  |  | $ | 5,099 |
Income tax benefit at our statutory rate associated with stock-based compensation |  |  | (1,692 | ) |  |  | (3,238 | ) |  |  | (1,989 | )
Stock-based compensation expense, net |  | $ | 4,969 |  |  | $ | 5,065 |  |  | $ | 3,110 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  |  |  |  |  | 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 |  |  | 503,685 |  |  | $ | 11.14 |  |  |  | 396,033 |  |  | $ | 12.06 |  |  |  | 337,506 |  |  | $ | 9.57 |
Granted |  |  | 391,836 |  |  |  | 14.63 |  |  |  | 307,943 |  |  |  | 10.40 |  |  |  | 237,500 |  |  |  | 12.88 |
Vested |  |  | (225,570 | ) |  |  | 11.21 |  |  |  | (200,291 | ) |  |  | 11.82 |  |  |  | (178,973 | ) |  |  | 8.46 |
Forfeited |  |  | (91,057 | ) |  |  | 13.27 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Outstanding - end of period |  |  | 578,894 |  |  | $ | 13.14 |  |  |  | 503,685 |  |  | $ | 11.14 |  |  |  | 396,033 |  |  | $ | 12.06 |
Restricted stock - Class A common: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 462,632 |  |  | $ | 10.63 |  |  |  | 415,082 |  |  | $ | 10.15 |  |  |  | 374,693 |  |  | $ | 9.46 |
Granted |  |  | 220,080 |  |  |  | 12.65 |  |  |  | 275,076 |  |  |  | 10.84 |  |  |  | 218,612 |  |  |  | 11.25 |
Vested |  |  | (274,926 | ) |  |  | 10.48 |  |  |  | (227,526 | ) |  |  | 10.00 |  |  |  | (178,223 | ) |  |  | 10.04 |
Outstanding - end of period |  |  | 407,786 |  |  | $ | 11.82 |  |  |  | 462,632 |  |  | $ | 10.63 |  |  |  | 415,082 |  |  | $ | 10.15 |
Restricted stock units - common: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 209,500 |  |  | $ | 15.70 |  |  |  | - |  |  | $ | - |  |  |  |  |  |  |  |  |
Granted |  |  | - |  |  |  | - |  |  |  | 215,500 |  |  |  | 15.70 |  |  |  |  |  |  |  |  |
Vested |  |  | (209,500 | ) |  | $ | 15.70 |  |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Forfeited |  |  | - |  |  |  | - |  |  |  | (6,000 | ) |  |  | 15.70 |  |  |  |  |  |  |  |  |
Outstanding - end of period |  |  | - |  |  | $ | - |  |  |  | 209,500 |  |  | $ | 15.70 |  |  |  |  |  |  |  |  |

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