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Note 3 - Revenue (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Revenue from Contract with Customer, Excluding Assessed Tax [1] $ 57,833 $ 53,165 $ 116,003 $ 103,810
Sterilization and Disinfection Control [Member] | GKE GmbH [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 5,863   $ 12,117  
[1] Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.