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Note 5 - Inventories (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Selling Expense $ 4.9 $ 2.9 $ 8.6 $ 5.4