Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ (15,714)	$ 7,416	$ 41,054
Available-for-sale securities
Available-for-sale securities, Pre-tax	0	(44)	12
Available-for-sale securities, Tax	0	12	(3)
Available-for-sale securities, Net of Tax	0	(32)	9
Postemployment severance actuarial change
Postemployment severance actuarial change, Pre-tax	941	258	596
Postemployment severance actuarial change, Tax	(242)	(66)	(154)
Postemployment severance actuarial change, Net of Tax	699	192	442
Unrealized gain (loss) on interest rate swap
Unrealized gain (loss) on interest rate swap, Pre-tax	1,793	0	0
Unrealized gain (loss) on interest rate swap, Tax	(462)	0	0
Unrealized gain (loss) on interest rate swap, Net of Tax	1,331	0	0
Reclassification to (earnings) loss:
Amortization of actuarial change, Pre-tax	(522)	(427)	(338)
Amortization of actuarial change, Tax	134	110	87
Amortization of actuarial change, Net of Tax	(388)	(317)	(251)
Interest rate swap, Pre-tax	194	0	0
Interest rate swap, Tax	(50)	0	0
Interest rate swap, Net of Tax	144	0	0
Other comprehensive income (loss)
Other comprehensive income (loss), Pre-tax	2,406	(213)	270
Other comprehensive income (loss), Tax	(620)	56	(70)
Other comprehensive income (loss), Net of Tax	1,786	(157)	200
Total comprehensive income (loss)	$ (13,928)	$ 7,259	$ 41,254