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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based compensation expense | $ 837 | $ 662 | $ 1,669 | $ 1,061
Stock Options and SARs [Member] |  |  |  |
Share-based compensation expense | 326 | 345 | 778 | 510
Restricted Stock [Member] |  |  |  |
Share-based compensation expense | 435 | 203 | 638 | 363
Performance Shares [Member] |  |  |  |
Share-based compensation expense | $ 76 | $ 114 | $ 253 | $ 188

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