Annual report pursuant to Section 13 and 15(d)

Note 6 - Commitments and Contingencies (Details Textual)

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Note 6 - Commitments and Contingencies (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Operating Leases, Rent Expense, Net, Total $ 10.8 $ 9.8 $ 8.1