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Note 6 - Inventories (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Selling Expense $ 2.0 $ 2.4 $ 7.0 $ 7.2