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Note 6 - Shareholders' Equity - Non-cash Stock Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Stock-based comepensation expense $ 890 $ 653
Employee Stock Option [Member]    
Stock-based comepensation expense 817 642
Restricted Stock [Member]    
Stock-based comepensation expense $ 73 $ 11