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Note 6 - Stock-based Compensation - Non-cash Stock Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Stock-based comepensation expense $ 304 $ 175 $ 534 $ 360
Share-based Payment Arrangement, Option [Member]        
Stock-based comepensation expense 278 142 470 316
Restricted Stock [Member]        
Stock-based comepensation expense $ 26 $ 33 $ 64 $ 44