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Note 7 - Stock-based Compensation - Non-cash Stock Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Stock-based comepensation expense | $ 943 | $ 753
Share-based Payment Arrangement, Option [Member] |  |
Stock-based comepensation expense | 838 | 623
Restricted Stock [Member] |  |
Stock-based comepensation expense | $ 105 | $ 130

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