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Note 10 - Revenue and Revenue Recognition - Disaggregation of Revenue (Details) - Customer Concentration Risk [Member]
6 Months Ended
Nov. 30, 2025
Nov. 30, 2024
Revenue from Contract with Customer Benchmark [Member] | End User Customers [Member]    
Percentage 74.00% 76.00%
Revenue, Product and Service Benchmark [Member] | Distributors [Member]    
Percentage 26.00% 24.00%