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, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Foreign Currency Loss	$ (29)	$ (8)	$ (12)	$ (15)
Gain on Supplemental Employee Retirement Plan Investments	413	29	764	396
Other	(121)	(105)	(203)	(173)
Non-operating income (expense), net	$ 263	$ (84)	$ 549	$ 208