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Note 6 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Year Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Stock-based compensation expense, gross |  | $ | 5,099 |  |  | $ | 4,019 |  |  | $ | 5,012 |
Income tax benefit at our statutory rate associated with stock-based compensation |  |  | (1,989 | ) |  |  | (1,567 | ) |  |  | (1,955 | )
Stock-based compensation expense, net |  | $ | 3,110 |  |  | $ | 2,452 |  |  | $ | 3,057 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Year Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  |  |  |  |  | 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 |  |  | 337,506 |  |  | $ | 9.57 |  |  |  | 385,056 |  |  | $ | 9.09 |  |  |  | 274,838 |  |  | $ | 4.43 |
Granted |  |  | 237,500 |  |  |  | 12.88 |  |  |  | 150,308 |  |  |  | 10.27 |  |  |  | 312,961 |  |  |  | 11.78 |
Vested |  |  | (178,973 | ) |  |  | 8.46 |  |  |  | (197,858 | ) |  |  | 9.16 |  |  |  | (202,743 | ) |  |  | 6.93 |
Outstanding - end of period |  |  | 396,033 |  |  | $ | 12.06 |  |  |  | 337,506 |  |  | $ | 9.57 |  |  |  | 385,056 |  |  | $ | 9.09 |
|  | Year Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  |  |  |  |  | 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 - Class A common: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 374,693 |  |  | $ | 9.46 |  |  |  | 204,473 |  |  | $ | 9.81 |  |  |  | - |  |  | $ | - |
Granted |  |  | 218,612 |  |  |  | 11.25 |  |  |  | 287,513 |  |  |  | 9.37 |  |  |  | 236,294 |  |  |  | 9.80 |
Vested |  |  | (178,223 | ) |  |  | 10.04 |  |  |  | (117,293 | ) |  |  | 9.85 |  |  |  | (31,821 | ) |  |  | 9.75 |
Outstanding - end of period |  |  | 415,082 |  |  | $ | 10.15 |  |  |  | 374,693 |  |  | $ | 9.46 |  |  |  | 204,473 |  |  | $ | 9.81 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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