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Note 6 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Notes Tables |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Year Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Stock-based compensation expense, gross |  | $ | 4,019 |  |  | $ | 5,012 |  |  | $ | 1,974 |
Income tax benefit at our statutory rate associated with stock-based compensation |  |  | (1,567 | ) |  |  | (1,955 | ) |  |  | (770 | )
Stock-based compensation expense, net |  | $ | 2,452 |  |  | $ | 3,057 |  |  | $ | 1,204 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Year Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
|  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value Per Share |  |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value Per Share |  |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value Per Share |
Restricted stock - common: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 385,056 |  |  | $ | 9.09 |  |  |  | 274,838 |  |  | $ | 4.43 |  |  |  | - |  |  | $ | - |
Granted |  |  | 150,308 |  |  |  | 10.27 |  |  |  | 312,961 |  |  |  | 11.78 |  |  |  | 382,062 |  |  |  | 5.20 |
Vested |  |  | (197,858 | ) |  |  | 9.16 |  |  |  | (202,743 | ) |  |  | 6.93 |  |  |  | (107,224 | ) |  |  | 7.16 |
Outstanding - end of period |  |  | 337,506 |  |  | $ | 9.57 |  |  |  | 385,056 |  |  | $ | 9.09 |  |  |  | 274,838 |  |  | $ | 4.43 |
|  | Year Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
|  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value Per Share |  |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value Per Share |  |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value Per Share |
Restricted stock - Class A common: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 204,473 |  |  | $ | 9.81 |  |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |
Granted |  |  | 287,513 |  |  |  | 9.37 |  |  |  | 236,294 |  |  |  | 9.80 |  |  |  | - |  |  |  | - |
Vested |  |  | (117,293 | ) |  |  | 9.85 |  |  |  | (31,821 | ) |  |  | 9.75 |  |  |  | - |  |  |  | - |
Outstanding - end of period |  |  | 374,693 |  |  | $ | 9.46 |  |  |  | 204,473 |  |  | $ | 9.81 |  |  |  | - |  |  | $ | - |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Year Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
|  | Number of Shares Underlying Options |  |  | Weighted Average Exercise Price |  |  | Number of Shares Underlying Options |  |  | Weighted Average Exercise Price |  |  | Number of Shares Underlying Options |  |  | Weighted Average Exercise Price |
Common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding - beginning of period |  |  | 274,746 |  |  | $ | 1.99 |  |  |  | 274,746 |  |  | $ | 1.99 |  |  |  | 1,316,068 |  |  | $ | 5.98 |
Options granted |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Options exercised |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (119,822 | ) |  |  | 2.34 |
Options forfeited |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Options expired |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (921,500 | ) |  |  | 7.64 |
Options outstanding - end of period |  |  | 274,746 |  |  | $ | 1.99 |  |  |  | 274,746 |  |  | $ | 1.99 |  |  |  | 274,746 |  |  | $ | 1.99 |
Options exercisable at end of period |  |  | 206,064 |  |  | $ | 1.99 |  |  |  | 137,376 |  |  | $ | 1.99 |  |  |  | 68,688 |  |  | $ | 1.99 |

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