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Note 6 - Segment Information - Geographic Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue $ 4,565 $ 3,541 $ 11,880 $ 9,431
UNITED STATES        
Revenue 3,496 2,354 8,978 6,783
CANADA        
Revenue 1,033 1,134 2,808 2,577
Other Countries [Member]        
Revenue $ 36 $ 53 $ 94 $ 71