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Note 6 - Segment Information - Geographic Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Revenue $ 4,523 $ 2,857
UNITED STATES    
Revenue 3,630 2,260
CANADA    
Revenue 893 580
Other Countries [Member]    
Revenue $ 0 $ 17