Note 9. Accumulated Other Comprehensive Income - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income at beginning of period	$ 2,137	$ 1,937
Other Comprehensive Income (Loss) before Reclassifications	114	104
Reclassification to (earnings) loss	(83)	(65)
Net current-period other comprehensive income (loss)	31	39
Accumulated Other Comprehensive Income at end of period	2,168	1,976
Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income at beginning of period	32	23
Other Comprehensive Income (Loss) before Reclassifications	(18)	(6)
Reclassification to (earnings) loss	0	0
Net current-period other comprehensive income (loss)	(18)	(6)
Accumulated Other Comprehensive Income at end of period	14	17
Postemployment Benefits, Net Actuarial Gain (Loss)
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income at beginning of period	2,105	1,914
Other Comprehensive Income (Loss) before Reclassifications	132	110
Reclassification to (earnings) loss	(83)	(65)
Net current-period other comprehensive income (loss)	49	45
Accumulated Other Comprehensive Income at end of period	$ 2,154	$ 1,959