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Note 10 - Employee Benefit Plans (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 100.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 4.00%    
Defined Contribution Plan, Cost $ 663 $ 680 $ 501