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Note 7 - Stock-based Compensation - Non-cash Stock Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Stock-based comepensation expense $ 230 $ 185
Share-based Payment Arrangement, Option [Member]    
Stock-based comepensation expense 192 174
Restricted Stock [Member]    
Stock-based comepensation expense $ 38 $ 11