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, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Gain (Loss) on SERP Investments	$ 1,032	$ (8)	$ 306	$ 756
Other	(62)	(197)	(235)	(412)
Non-operating income (expense), net	$ 970	$ (205)	$ 71	$ 344