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Note 6 - Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2017
Notes Tables |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Three Months Ended March 31, |
|  | 2017 |  |  | 2016 |
Stock-based compensation expense, gross |  | $ | 1,337 |  |  | $ | 1,284 |
Income tax benefit at our statutory rate associated with stock-based compensation |  |  | (521 | ) |  |  | (501 | )
Stock-based compensation expense, net |  | $ | 816 |  |  | $ | 783 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Three Months Ended |
|  | March 31, 2017 |  |  | March 31, 2016 |
|  |  |  |  |  | Weighted- |  |  |  |  |  |  | Weighted- |
|  |  |  |  |  | Average |  |  |  |  |  |  | Average |
|  | Number |  |  | Grant Date |  |  | Number |  |  | Grant Date |
|  | of |  |  | Fair Value |  |  | of |  |  | Fair Value |
|  | Shares |  |  | Per Share |  |  | Shares |  |  | Per Share |
Restricted common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 396,033 |  |  | $ | 12.06 |  |  |  | 337,506 |  |  | $ | 9.57 |
Granted |  |  | 307,943 |  |  | $ | 10.40 |  |  |  | 237,500 |  |  | $ | 12.88 |
Vested |  |  | (200,291 | ) |  | $ | 11.82 |  |  |  | (178,973 | ) |  | $ | 8.46 |
Outstanding - end of period |  |  | 503,685 |  |  | $ | 11.14 |  |  |  | 396,033 |  |  | $ | 12.06 |
Restricted Class A common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding - beginning of period |  |  | 415,082 |  |  | $ | 10.15 |  |  |  | 374,693 |  |  | $ | 9.46 |
Granted |  |  | 198,220 |  |  | $ | 10.60 |  |  |  | 218,612 |  |  | $ | 11.25 |
Vested |  |  | (227,526 | ) |  | $ | 10.00 |  |  |  | (178,223 | ) |  | $ | 10.04 |
Outstanding - end of period |  |  | 385,776 |  |  | $ | 10.47 |  |  |  | 415,082 |  |  | $ | 10.15 |

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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 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: 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=96867065&loc=d3e5047-113901 Reference 3: 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 + 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=96867065&loc=d3e5070-113901 + Details
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