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Note 12 - Leases (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2024
Lessee, Operating Lease, Discount Rate 8.50%    
Leases Over 12 Months [Member]      
Operating Lease, Expense $ 0.1 $ 0.2 $ 0.2