Note 2. Recent Accounting Pronouncements and Supplemental Information - Components of Non-operating income (expense), net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Gain on Supplemental Employee Retirement Plan Investments	$ 1,381	$ 716	$ 2,139	$ 774
Other	(1)	1	(16)	(56)
Non-operating income (expense), net	$ 1,380	$ 717	$ 2,123	$ 718