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Note 10 - Property, Plant and Equipment (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Depreciation, Depletion and Amortization, Total $ 1.0 $ 1.1 $ 2.1 $ 2.1