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Note 4 - Revenue Recognition (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Jun. 30, 2024
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total $ 12.1   $ 12.1   $ 11.5
Contract with Customer, Liability 79.3   79.3   $ 73.5
Contract with Customer, Liability, Revenue Recognized $ 1.8 $ 2.7 $ 70.9 $ 74.7