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Note 4 - Property and Equipment (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Depreciation $ 0.8 $ 0.8 $ 1.6 $ 1.6
Equipment [Member]        
Property, Plant and Equipment, Disposals     $ 3.3