Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (21,314)	$ (838)	$ (26,363)	$ 4,548
Available-for-sale securities
Available-for-sale securities, Pre-tax	0	(13)	0	(38)
Available-for-sale securities, Tax	0	3	0	10
Available-for-sale securities, Net of Tax	0	(10)	0	(28)
Postemployment severance actuarial change
Postemployment severance actuarial change, Pre-tax	298	124	563	302
Postemployment severance actuarial change, Tax	(76)	(32)	(145)	(78)
Postemployment severance actuarial change, Net of Tax	222	92	418	224
Unrealized gain (loss) on interest rate swap
Unrealized gain (loss) on interest rate swap, Pre-tax	452	0	101	0
Unrealized gain (loss) on interest rate swap, Tax	(116)	0	(26)	0
Unrealized gain (loss) on interest rate swap, Net of tax	336	0	75	0
Amortization of actuarial change
Amortization of actuarial change, Pre-tax	(134)	(109)	(270)	(221)
Amortization of actuarial change, Tax	34	28	69	57
Amortization of actuarial change, Net of Tax	(100)	(81)	(201)	(164)
Interest rate swap, Pre-tax	75	0	133	0
Interest rate swap, Tax	(19)	0	(34)	0
Interest rate swap, Net of Tax	56	0	99	0
Other comprehensive income (loss)
Other comprehensive income (loss), Pre-tax	691	2	527	43
Other comprehensive income (loss), Tax	(177)	(1)	(136)	(11)
Other comprehensive income (loss)	514	1	391	32
Total comprehensive income (loss)	$ (20,800)	$ (837)	$ (25,972)	$ 4,580