Note 10. Stock Compensation Plans - Unrestricted Share Grants Textuals (Details) - Unrestricted Shares Director Compensation - Stock Option and Incentive Plan 2014 - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangements
Share-based Compensation Arrangements, Grants in Period	4,258	4,236	7,694
Share-based Compensation Arrangements, Grants in Period, Weighted Average Grant Date Fair Value	$ 16.99	$ 17.69	$ 20.15
Share-based Compensation Arrangements, Vested in Period, Fair Value	$ 0.1	$ 0.1	$ 0.2