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Note 6 - Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 35,880 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance |  | 0 |
Proceeds from Stock Options Exercised |  | $ 838 |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price |  | $ 23.37 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  | $ 718 |
Benefit (Shortfall) of Tax Deductions from Share-based Compensation | $ 500 | 700 |
2005 Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 2,605,454 |  |
Minimum [Member] |  |  |
Performance-based Restricted Stock Units, Number of Shares That May Vest, Percentage of Target | 0.00% |  |
Maximum [Member] |  |  |
Performance-based Restricted Stock Units, Number of Shares That May Vest, Percentage of Target | 150.00% |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |
Share-based Payment Arrangement, Expense | $ 1,500 | $ 1,500 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 8,600 |  | $ 15,100
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition | 1 year 219 days |  |
Performance-based Restricted Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |

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