Note 2. Recent Accounting Pronouncements and Supplemental Information - Components of Non-operating income (expense), net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Gain (Loss) on SERP Investments	$ (1,784)	$ 1,032	$ (1,010)	$ 306
Other	(294)	(62)	(350)	(235)
Other income expense net	$ (2,078)	$ 970	$ (1,360)	$ 71