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Note 16 - Segment Data - Long-lived Assets by Geographic Area (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Mar. 31, 2020
Long-lived assets $ 24,528 $ 24,546
UNITED STATES    
Long-lived assets 21,443 23,306
Non-US [Member]    
Long-lived assets $ 3,085 $ 1,240