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Note 3 - Revenue (Details Textual) - Customer Concentration Risk [Member] - Revenue Benchmark [Member]
3 Months Ended 9 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Number of Major Customers 1 1    
One Customer [Member]        
Number of Major Customers     1 1
Concentration Risk, Percentage 46.00% 49.00% 52.00% 52.00%