Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Revenue Recognition (Details Textual)

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Note 4 - Revenue Recognition (Details Textual) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2019
Mar. 31, 2019
Jun. 30, 2018
Contract with Customer, Liability, Total $ 62.4 $ 62.4 $ 61.2
Contract with Customer, Liability, Revenue Recognized $ 1.4 $ 59.3