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Note 3 - Revenue (Details Textual) - Customer Concentration Risk [Member] - Revenue Benchmark [Member]
3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Number of Major Customers 2 2 2 2
Two Customers [Member]        
Concentration Risk, Percentage 45.00% 75.00% 45.00% 73.00%