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Note 4 - Revenue Recognition (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Jun. 30, 2023
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total $ 10.3   $ 10.3  
Contract with Customer, Liability 63.1   63.1 $ 77.8
Contract with Customer, Liability, Revenue Recognized $ 17.7 $ 30.9 $ 71.9