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Note 11 - Income Taxes - Provisions for Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Current tax provision      
U.S. Federal $ 1,831 $ 3,732 $ 2,282
U.S. State 449 715 510
Foreign 1,166 1,299 849
Total current tax expense 3,446 5,746 3,641
Deferred tax provision:      
U.S. Federal (741) (1,589) (126)
U.S. State (106) (216) (32)
Foreign (1,460) (678) (370)
Total deferred tax expense (2,307) (2,483) (528)
Total income tax expense $ 1,139 $ 3,263 $ 3,113