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Note 3 - Revenue (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Revenue from Contract with Customer, Excluding Assessed Tax [1] $ 62,840,000 $ 53,473,000 $ 178,843,000 $ 157,283,000
Sterilization and Disinfection Control [Member] | GKE GmbH [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 6,854,000 $ 3,837,000 $ 18,971,000 $ 3,837
[1] Intersegment revenues are not significant and are eliminated to arrive at consolidated totals.