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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based compensation expense | $ 551 | $ 438 | $ 1,032 | $ 1,490
Related income tax benefit | 67 | 74 | 125 | 185
Stock Options and SARs [Member] |  |  |  |
Share-based compensation expense | 105 | 121 | 178 | 944
Restricted Stock [Member] |  |  |  |
Share-based compensation expense | 209 | 140 | 397 | 264
Performance Shares [Member] |  |  |  |
Share-based compensation expense | $ 237 | $ 177 | $ 457 | $ 282

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