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Note 10 - Property, Plant and Equipment (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Depreciation, Depletion and Amortization $ 0.6 $ 0.7 $ 1.2 $ 1.4