Note 8. Stock Compensation Plans Deferred Share Units (Details) - Non-Employee Directors Stock Compensation Deferral Plan - Deferred Share Units Director Compensation - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangements
Share-based Compensation Arrangements, Grants in Period	12,159	19,207
Share-based Compensation Arrangements, Grants in Period, Weighted Average Grant Date Fair Value	$ 20.15	$ 15.79
Share-based Compensation Arrangements, Vested in Period, Fair Value	$ 0.2	$ 0.3