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Note 6 - Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2015 |  |  | 2014 |
Stock-based compensation expense, gross |  | $ | 993 |  |  | $ | 2,071 |
Income tax benefit at our statutory rate associated with stock-based compensation |  |  | (387 | ) |  |  | (808 | )
Stock-based compensation expense, net |  | $ | 606 |  |  | $ | 1,263 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Three Months Ended |
|  | March 31, 2015 |  |  | March 31, 2014 |
|  |  |  |  |  | Weighted- |  |  |  |  |  |  | Weighted- |
|  |  |  |  |  | Average |  |  |  |  |  |  | Average |
|  | Number |  |  | Grant Date |  |  | Number |  |  | Grant Date |
|  | of |  |  | Fair Value |  |  | of |  |  | Fair Value |
|  | Shares |  |  | Per Share |  |  | Shares |  |  | 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 |
Vested |  |  | (197,858 | ) |  | $ | 9.16 |  |  |  | (202,743 | ) |  | $ | 6.93 |
Outstanding - end of period |  |  | 337,506 |  |  | $ | 9.57 |  |  |  | 385,056 |  |  | $ | 9.09 |
|  | Three Months Ended |
|  | March 31, 2015 |  |  | March 31, 2014 |
|  |  |  |  |  | Weighted- |  |  |  |  |  |  | Weighted- |
|  |  |  |  |  | Average |  |  |  |  |  |  | Average |
|  | Number |  |  | Grant Date |  |  | Number |  |  | Grant Date |
|  | of |  |  | Fair Value |  |  | of |  |  | Fair Value |
|  | Shares |  |  | Per Share |  |  | Shares |  |  | 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] |
|  | Three Months Ended |
|  | March 31, 2015 |  |  | March 31, 2014 |
|  |  |  |  |  | Weighted- |  |  |  |  |  |  | Weighted- |
|  | Number of |  |  | Average |  |  | Number of |  |  | Average |
|  | Shares |  |  | Exercise |  |  | Shares |  |  | Exercise |
|  | Underlying |  |  | Price |  |  | Underlying |  |  | Price |
|  | Options |  |  | Per Share |  |  | Options |  |  | Per Share |
Stock options - common: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 274,746 |  |  | $ | 1.99 |  |  |  | 274,746 |  |  | $ | 1.99 |
Options exercised |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |
Options expired |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |
Outstanding - end of period |  |  | 274,746 |  |  | $ | 1.99 |  |  |  | 274,746 |  |  | $ | 1.99 |
Exercisable at end of period |  |  | 137,376 |  |  | $ | 1.99 |  |  |  | 68,688 |  |  | $ | 1.99 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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