Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (5,049)	$ 5,386
Available-for-sale securities
Available-for-sale securities, Pre-tax		(25)
Available-for-sale securities, Tax		7
Available-for-sale securities, Net of Tax		(18)
Postemployment severance actuarial change
Postemployment severance actuarial change, Pre-tax	265	178
Postemployment severance actuarial change, Tax	(69)	(46)
Postemployment severance actuarial change, Net of Tax	196	132
Unrealized gain (loss) on interest rate swap
Derivative gain (loss), Pre-tax	(351)
Derivative gain (loss), Tax	90
Derivative gain (loss), Net of tax	(261)
Amortization of actuarial change
Amortization of actuarial change, Pre-tax	(136)	(112)
Amortization of actuarial change, Tax	35	29
Amortization of actuarial change, Net of Tax	(101)	(83)
Derivatives, Pre-tax	58
Derivatives, Tax	(15)
Derivatives, Net of Tax	43
Other comprehensive income (loss)
Other comprehensive income (loss), Pre-tax	(164)	41
Other comprehensive income (loss), Tax	41	(10)
Other comprehensive income (loss), Net of Tax	(123)	31
Total comprehensive income (loss)	$ (5,172)	$ 5,417