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Note 9 - Revenue and Revenue Recognition - Disaggregation of Revenue (Details) - Customer Concentration Risk [Member]
3 Months Ended
Aug. 31, 2025
Aug. 31, 2024
Revenue from Contract with Customer Benchmark [Member] | End User Customers [Member]    
Percentage 75.00% 76.00%
Revenue, Product and Service Benchmark [Member] | Distributors [Member]    
Percentage 25.00% 24.00%