Note 11. Share Owners' Equity - Textuals (Details) - USD ($)	12 Months Ended			92 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2023	Nov. 10, 2020	Nov. 08, 2018	Aug. 23, 2017	Sep. 29, 2016	Oct. 21, 2015
Stock Repurchase Program, Authorized Amount	$ 100,000,000			$ 100,000,000
Treasury Stock, Value, Acquired, Cost Method		$ (9,122,000)	$ (2,996,000)
Treasury Stock Acquired, Average Cost Per Share		$ 18.82	$ 15.51	$ 15.27
share repurchase program October 2015
Stock Repurchase Program, Authorized Amount									$ 20,000,000
share repurchase plan September 2016 extension
Stock Repurchase Program, Authorized Amount								$ 20,000,000
Share Repurchase Program August 2017 Extension
Stock Repurchase Program, Authorized Amount							$ 20,000,000
Share Repurchase Program November 2018 Extension
Stock Repurchase Program, Authorized Amount						$ 20,000,000
Share Repurchase Program November 2020 Extension
Stock Repurchase Program, Authorized Amount					$ 20,000,000
Treasury Stock, Common
Treasury Stock, Value, Acquired, Cost Method	$ 0	$ (9,122,000)	$ (2,996,000)	$ (88,800,000)