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Note 7 - Stock-based Compensation - Non-cash Stock Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Stock-based comepensation expense $ 753 $ 890
Share-based Payment Arrangement, Option [Member]    
Stock-based comepensation expense 623 817
Restricted Stock [Member]    
Stock-based comepensation expense $ 130 $ 73