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Note 10 - Property, Plant and Equipment (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Depreciation, Depletion and Amortization $ 0.6 $ 0.6 $ 1.7 $ 2.0