Note 7. Accumulated Other Comprehensive Income - Reclassifications from Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Reclassification Adjustment from Accumulated Other Comprehensive Income
Postemployment Benefits, Amortization of Actuarial Gain	$ 100	$ 58	$ 302	$ 191
Total Reclassification for the Period from AOCI	(74)	(38)	(208)	(126)
Cost of Sales
Reclassification Adjustment from Accumulated Other Comprehensive Income
Postemployment Benefits, Amortization of Actuarial Gain	0	37	0	124
Selling and Administrative Expenses
Reclassification Adjustment from Accumulated Other Comprehensive Income
Postemployment Benefits, Amortization of Actuarial Gain	0	21	0	67
Non-operating income (expense), net
Reclassification Adjustment from Accumulated Other Comprehensive Income
Realized Investment Gain (Loss) on available-for-sale securities	0	(1)	0	(4)
Postemployment Benefits, Amortization of Actuarial Gain	100	0	302	0
Derivative Gain (Loss)	0	0	(21)	0
Benefit (Provision) for Income Taxes
Reclassification Adjustment from Accumulated Other Comprehensive Income
Realized Investment Gain (Loss) on available-for-sale securities	0	0	0	1
Postemployment Benefits, Amortization of Actuarial Gain	(26)	(19)	(78)	(62)
Derivative Gain (Loss)	0	0	5	0
Net Income
Reclassification Adjustment from Accumulated Other Comprehensive Income
Realized Investment Gain (Loss) on available-for-sale securities	0	(1)	0	(3)
Postemployment Benefits, Amortization of Actuarial Gain	74	39	224	129
Derivative Gain (Loss)	0	0	(16)	0
Total Reclassification for the Period from AOCI	$ 74	$ 38	$ 208	$ 126