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Note 6 - Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2016
Notes Tables |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Stock-based compensation expense, gross |  | $ | 1,271 |  |  | $ | 1,009 |  |  | $ | 3,827 |  |  | $ | 3,011 |
Income tax benefit at our statutory rate associated with share-based compensation |  |  | (496 | ) |  |  | (394 | ) |  |  | (1,493 | ) |  |  | (1,174 | )
Stock-based compensation expense, net |  | $ | 775 |  |  | $ | 615 |  |  | $ | 2,334 |  |  | $ | 1,837 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Nine Months Ended |
|  | September 30, 2016 |  |  | September 30, 2015 |
|  |  |  |  |  | Weighted- |  |  |  |  |  |  | Weighted- |
|  |  |  |  |  | average |  |  |  |  |  |  | average |
|  |  |  |  |  | Grant Date |  |  |  |  |  |  | Grant Date |
|  | Number of |  |  | Fair Value |  |  | Number of |  |  | Fair Value |
|  | Shares |  |  | Per Share |  |  | Shares |  |  | Per Share |
Restricted stock - common: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 337,506 |  |  | $ | 9.57 |  |  |  | 385,056 |  |  | $ | 9.09 |
Granted |  |  | 237,500 |  |  | $ | 12.88 |  |  |  | 150,308 |  |  | $ | 10.27 |
Vested |  |  | (178,973 | ) |  | $ | 8.46 |  |  |  | (197,858 | ) |  | $ | 9.16 |
Outstanding - end of period |  |  | 396,033 |  |  | $ | 12.06 |  |  |  | 337,506 |  |  | $ | 9.57 |
|  | Nine Months Ended |
|  | September 30, 2016 |  |  | September 30, 2015 |
|  |  |  |  |  | Weighted-average |  |  |  |  |  |  | Weighted-average |
|  |  |  |  |  | Grant Date |  |  |  |  |  |  | Grant Date |
|  | Number of |  |  | Fair Value |  |  | Number of |  |  | Fair Value |
|  | Shares |  |  | Per Share |  |  | Shares |  |  | Per Share |
Restricted stock - class A common: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 374,693 |  |  | $ | 9.46 |  |  |  | 204,473 |  |  | $ | 9.81 |
Granted |  |  | 218,612 |  |  | $ | 11.25 |  |  |  | 287,513 |  |  | $ | 9.37 |
Vested |  |  | (178,223 | ) |  | $ | 10.04 |  |  |  | (117,293 | ) |  | $ | 9.85 |
Outstanding - end of period |  |  | 415,082 |  |  | $ | 10.15 |  |  |  | 374,693 |  |  | $ | 9.46 |

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