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Note 7 - Stock-based Compensation (Details) - Stock-based Compensation Expense and Related Income Tax Benefit (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Stock-based Compensation Expense and Related Income Tax Benefit [Abstract] |  |  |
Stock-based compensation expense, gross | $ 5,012 us-gaap_AllocatedShareBasedCompensationExpense | $ 1,974 us-gaap_AllocatedShareBasedCompensationExpense | $ 878 us-gaap_AllocatedShareBasedCompensationExpense
Income tax benefit at our statutory rate associated with stock-based compensation | (1,955)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | (770)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | (342)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Stock-based compensation expense, net | $ 3,057 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | $ 1,204 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | $ 536 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + 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 FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References No definition available. + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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