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Note 13 - Geographic Sales Information - Revenue by Geographic Area (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Revenue $ 28,156 $ 41,804
UNITED STATES    
Revenue 14,783 24,569
All Other Countries [Member]    
Revenue $ 13,373 $ 17,235