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Note 7 - Share-based Compensation - Shared-based Compensation Expense and the Related Tax Benefit (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based compensation expense | $ 1,088 | $ 729 | $ 2,757 | $ 1,790
Stock Options and SARs [Member] |  |  |  |
Share-based compensation expense | 327 | 412 | 1,105 | 921
Restricted Stock [Member] |  |  |  |
Share-based compensation expense | 545 | 203 | 1,183 | 566
Performance Shares [Member] |  |  |  |
Share-based compensation expense | $ 216 | $ 114 | $ 469 | $ 303

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