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Note 2 - Revenue Recognition (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Dec. 31, 2021
Mar. 31, 2021
Contract with Customer, Asset, after Allowance for Credit Loss, Total $ 0 $ 0
Agena [Member]    
Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination $ 3,538