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Note 5 - Stock-Based Compensation (Details) - Tax Short-fall from Share-based Payment Arrangements - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Tax Short-fall from Share-based Payment Arrangements [Abstract] |  |  |  |
Short-fall of tax deductions in excess of grant-date fair value | $ (1,224) | $ 50 | $ (5,619) | $ (1,177)
Benefit of tax deductions on grant-date fair value | 1,554 | $ (50) | 6,146 | $ 1,177
Total benefit of tax deductions | $ 330 |  | $ 527 |

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- Definition The total benefit of tax deductions. + References No definition available. + Details
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- Definition Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 + Details
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