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Note 7 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Year Ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Stock-based compensation expense, gross |  | $ | 5,012 |  |  | $ | 1,974 |  |  | $ | 878 |
Income tax benefit at our statutory rate associated with stock-based compensation |  |  | (1,955 | ) |  |  | (770 | ) |  |  | (342 | )
Stock-based compensation expense, net |  | $ | 3,057 |  |  | $ | 1,204 |  |  | $ | 536 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Year Ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
|  |  |  |  |  | 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 |  |  | 274,838 |  |  | $ | 4.43 |  |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |
Granted |  |  | 312,961 |  |  |  | 11.78 |  |  |  | 382,062 |  |  |  | 5.20 |  |  |  | 432,396 |  |  |  | 1.65 |
Vested |  |  | (202,743 | ) |  |  | 6.93 |  |  |  | (107,224 | ) |  |  | 7.16 |  |  |  | (432,396 | ) |  |  | 1.65 |
Outstanding - end of period |  |  | 385,056 |  |  | $ | 9.09 |  |  |  | 274,838 |  |  | $ | 4.43 |  |  |  | - |  |  | $ | - |
|  | Year Ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
|  |  |  |  |  | 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 |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |  |  |  | 10,000 |  |  | $ | 4.94 |
Granted |  |  | 236,294 |  |  |  | 9.80 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Vested |  |  | (31,821 | ) |  |  | 9.75 |  |  |  | - |  |  |  | - |  |  |  | (10,000 | ) |  |  | 4.94 |
Outstanding - end of period |  |  | 204,473 |  |  | $ | 9.81 |  |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Year Ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
|  | 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 |  |  |  | 1,316,068 |  |  | $ | 5.98 |  |  |  | 1,002,350 |  |  | $ | 7.50 |
Options granted |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 359,568 |  |  |  | 1.99 |
Options exercised |  |  | - |  |  |  | - |  |  |  | (119,822 | ) |  |  | 2.34 |  |  |  | - |  |  |  | - |
Options forfeited |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (8,700 | ) |  |  | 5.32 |
Options expired |  |  | - |  |  |  | - |  |  |  | (921,500 | ) |  |  | 7.64 |  |  |  | (37,150 | ) |  |  | 8.72 |
Options outstanding - end of period |  |  | 274,746 |  |  | $ | 1.99 |  |  |  | 274,746 |  |  | $ | 1.99 |  |  |  | 1,316,068 |  |  | $ | 5.98 |
Options exercisable at end of period |  |  | 137,376 |  |  | $ | 1.99 |  |  |  | 68,688 |  |  | $ | 1.99 |  |  |  | 956,500 |  |  | $ | 7.48 |

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