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Note 6 - 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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Share-based compensation expense |  | $ (35) | $ 377 | $ 997 | $ 1,867
Related income tax benefit |  | 67 | 44 | 192 | 229
Stock Options and SARs [Member] |  |  |  |  |
Share-based compensation expense |  | 108 | 16 | 286 | 960
Restricted Stock [Member] |  |  |  |  |
Share-based compensation expense |  | 215 | 140 | 612 | 404
Performance Shares [Member] |  |  |  |  |
Share-based compensation expense | [1] | $ (358) | $ 221 | $ 99 | $ 503
[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 will not be met.

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