Note 10. Accumulated Other Comprehensive Income - Reclassifications from Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Reclassification Adjustment from Accumulated Other Comprehensive Income
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax	$ (23)	$ (27)	$ (46)	$ (52)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax	67	76	132	150
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	(90)	(103)	(178)	(202)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	0	(1)	0	(5)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	0	4	0	16
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	0	5	0	21
Total Reclassification for the Period from AOCI	67	72	132	134
Non-operating income (expense), net
Reclassification Adjustment from Accumulated Other Comprehensive Income
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	90	103	178	202
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	0	(5)	0	(21)
Benefit (Provision) for Income Taxes
Reclassification Adjustment from Accumulated Other Comprehensive Income
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax	(23)	(27)	(46)	(52)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	0	1	0	5
Net Income
Reclassification Adjustment from Accumulated Other Comprehensive Income
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax	67	76	132	150
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	0	(4)	0	(16)
Total Reclassification for the Period from AOCI	$ 67	$ 72	$ 132	$ 134