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Note 3 - Revenue (Details Textual) - Customer Concentration Risk [Member] - Revenue Benchmark [Member]
3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Number of Major Customers 1 1 1 1
One Customer [Member]        
Concentration Risk, Percentage 51.00% 45.00% 52.00% 44.00%