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Note 16 - Stock-Based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allocated Share-based Compensation Expense | $ 2,150 | $ 2,469 | $ 1,443
Employee Stock Option |  |  |
Allocated Share-based Compensation Expense | 297 | 475 | 472
Restricted Stock |  |  |
Allocated Share-based Compensation Expense | 1,619 | 1,850 | 857
Employee Stock Purchase Plan |  |  |
Allocated Share-based Compensation Expense | $ 234 | $ 144 | $ 114

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