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Note 4 - Fair Value Measurements (Details Textual)
$ in Thousands
6 Months Ended
Sep. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Nov. 17, 2022
USD ($)
Aug. 12, 2019
Belyntic Acquisition [Member] | Other Long-term Liabilities [Member]        
Business Combination, Contingent Consideration, Liability, Noncurrent $ 1,180   $ 1,500  
Senior Notes [Member] | The Notes [Member]        
Long-term Debt, Gross $ 172,500 $ 172,500    
Debt Instrument, Interest Rate, Stated Percentage 1.375%     1.375%
Accounts Receivable [Member] | Customer Concentration Risk [Member]        
Number of Major Customers 0