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, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Gain (Loss) on SERP Investments	$ (1,097)	$ 413	$ (726)	$ 764
Other	(129)	(150)	(173)	(215)
Non-operating income (expense), net	$ (1,226)	$ 263	$ (899)	$ 549