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Note 6 - Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 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 |  | 0
Proceeds from Stock Options Exercised |  |  | $ 0 | $ 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 |  |  | $ 600 | 800
2005 Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 2,389,185 |  | 2,389,185 |
Minimum [Member] |  |  |  |
Performance-based Restricted Stock Units, Number of Shares That May Vest, Percentage of Target | 0.00% |  | 0.00% |
Maximum [Member] |  |  |  |
Performance-based Restricted Stock Units, Number of Shares That May Vest, Percentage of Target | 150.00% |  | 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 | $ 1,800 | $ 1,900 | $ 4,800 | 5,300
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 11,500 | $ 11,800 | $ 11,500 | $ 11,800
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  | 2 years |
Performance-based Restricted Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 3 years |

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