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Note 10 - Property, Plant and Equipment (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Depreciation, Depletion and Amortization, Total $ 1.0 $ 1.1 $ 3.1 $ 3.2