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Note 16 - Segment Data - Long-lived Assets by Geographic Area (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Mar. 31, 2019
Long-lived assets $ 36,007 $ 23,548
UNITED STATES    
Long-lived assets 34,767 22,974
Non-US [Member]    
Long-lived assets $ 1,240 $ 574