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Note 10 - Property, Plant and Equipment (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Depreciation, Depletion and Amortization, Total $ 0.7 $ 1.2 $ 2.0 $ 2.9