Quarterly report pursuant to Section 13 or 15(d)

Note 2 - Revenue Recognition (Details Textual)

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Note 2 - Revenue Recognition (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Jun. 30, 2018
Contract with Customer, Liability, Total $ 9.7 $ 9.7 $ 9.3
Contract with Customer, Liability, Revenue Recognized $ 2.0 $ 5.6