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Note 14 - Income Taxes - Provisions for Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Current tax provision      
U.S. Federal $ 2,348 $ 1,831 $ 3,732
U.S. State 814 449 715
Foreign 993 1,166 1,299
Total current tax expense 4,155 3,446 5,746
Deferred tax provision:      
U.S. Federal 60 (741) (1,589)
U.S. State 599 (106) (216)
Foreign (2,730) (1,460) (678)
Total deferred tax expense (2,071) (2,307) (2,483)
Total income tax expense $ 2,084 $ 1,139 $ 3,263