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Note 14 - Income Taxes - Provisions for Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Current tax provision      
U.S. Federal $ 1,500 $ 2,348 $ 1,831
U.S. State 628 814 449
Foreign 404 993 1,166
Total current tax expense 2,532 4,155 3,446
Deferred tax provision:      
U.S. Federal (2,410) 60 (741)
U.S. State (619) 599 (106)
Foreign (474) (2,730) (1,460)
Total deferred tax benefit (3,503) (2,071) (2,307)
Total income tax (benefit) expense $ (971) $ 2,084 $ 1,139