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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
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based compensation expense |  | $ 729 | $ (35) | $ 1,790 | $ 997
Related income tax benefit |  | 78 | 67 | 207 | 192
Stock Options and SARs [Member] |  |  |  |  |
Share-based compensation expense |  | 412 | 108 | 921 | 286
Restricted Stock [Member] |  |  |  |  |
Share-based compensation expense |  | 203 | 215 | 566 | 612
Performance Shares [Member] |  |  |  |  |
Share-based compensation expense | [1] | $ 114 | $ (358) | $ 303 | $ 99
[1] | During the three and nine months ended September 30, 2019, the Company reversed $0.5 million of previously recognized expense for certain performance awards after determining that the performance conditions are not expected to be met.

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