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Note 11 - Share-based Compensation - Shared-based Compensation Expense and the Related Tax Benefit (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based compensation expense | $ 2,530 | $ 1,485 | $ 2,264
Related income tax benefit | 286 | 262 | 282
Stock Options and SARs [Member] |  |  |
Share-based compensation expense | 1,321 | 407 | 984
Restricted Stock [Member] |  |  |
Share-based compensation expense | 777 | 835 | 551
Performance Shares [Member] |  |  |
Share-based compensation expense | $ 432 | $ 243 | $ 729

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