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Note 12 - Equity Incentive Plan (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 18, 2013 | Jun. 07, 2011 | Jun. 05, 2009 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 13, 2017 | Jun. 04, 2003
Allocated Share-based Compensation Expense |  |  |  | $ 5,807 | $ 3,392 | $ 2,225 |  |
Share-based Compensation Arrangement by Share-based Payment Award Options and Stock Appreciation Rights Vested and Expected to Vest Outstanding Weighted Average Exercise Price |  |  |  | $ 33.70 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Options and Stock Ppreciation Rights Vested and Expected to Vest Outstanding Aggregate Intrinsic Value |  |  |  | $ 27,600 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding, Weighted Average Remaining ContractualTerm |  |  |  | 7 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Options and Stock Appreciation Rights Vested Aggregate Intrinsic Value |  |  |  | $ 22,000 | 16,700 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding, Intrinsic Value |  |  |  | 27,600 | 22,300 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercises in Period, Total Intrinsic Value |  |  |  | 500 | 2,100 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Options and Stock Appreciation Rights Vested in Period Fair Value |  |  |  | 2,100 | 1,300 |  |  |
Proceeds from Stock Options Exercised |  |  |  | $ 314 | $ 1,007 | $ 1,074 |  |
Employee Stock Option [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  | 3 years |  |  |  |
Share-based Compensation Arrangement Evaluation of Expected Volatility Assumption to Historical Volatility Average Period |  |  |  | 4 years |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  | 67,567 | 87,158 |  |  |
Restricted Stock Units (RSUs) [Member] | Director [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  | 1 year |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  | 9,970 |  |  |  |
Stock Options, SARs and Restricted Stock Awards [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  | 1,327,200 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  |  | $ 7,600 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  | 2 years 36 days |  |  |  |
Restricted Stock and Restricted Stock Units [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  |  | $ 2,300 | $ 1,000 |  |  |
Amended Two Thousand Three Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 3,800,000 |  | 2,350,000 |  |  |  |  | 1,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | 650,000 |  | 850,000 |  |  |  |  |
Number of Shares Available for Grant Reduced By Each Share Award Issued Other Than Options or SARs | 1.5 |  |  |  |  |  |  |
Second Amended Two Thousand Three Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  | 3,150,000 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized |  | 800,000 |  |  |  |  |  |
Number of Shares Available for Grant Reduced By Each Share Award Issued Other Than Options or SARs |  | 1.9 |  |  |  |  |  |
The 2017 Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  | 1,100,000 |  |  |  |
Number of Shares Available for Grant Reduced By Each Share Award Issued Other Than Options or SARs |  |  |  |  |  |  | 2 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  |  | 1,200,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 85,109 |  |  |  |
The 2017 Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  | 26,306 |  |  |  |
The 2017 Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  | 1 year |  |  |  |
The 2017 Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  | 4 years |  |  |  |
The 2003 Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 407,635 |  |  |  |
Two Thousand Three Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  | 64 years |  |  |  |

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