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Note 4 - Inventories (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Selling Expense $ 7.1 $ 4.9 $ 18.6 $ 14.5