CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Shares	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)
Beginning Balance (in shares) at Jun. 30, 2023		20,142,973
Beginning Balance at Jun. 30, 2023	$ 38,112	$ 20,144	$ 77,278	$ (26,479)	$ (32,831)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(3,875)			(3,875)
Cash flow hedges, net of taxes	1,022				1,022
Postretirement benefits curtailment, net of taxes	6,484				6,484
401(k) compensation expense, including reclassifications (in shares)		595,031
401(k) compensation expense, including reclassifications	1,694	$ 595	1,099
Share-based compensation	2,112		2,112
Issuance of common stock and stock option exercises (in shares)		526,323
Issuance of common stock and stock option exercises	0	$ 526	(526)
Ending Balance (in shares) at Jun. 30, 2024		21,264,327
Ending Balance at Jun. 30, 2024	45,549	$ 21,265	79,963	(30,354)	(25,325)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(14,516)			(14,516)
Cash flow hedges, net of taxes	(313)				(313)
Postretirement benefits curtailment, net of taxes	10,829				10,829
Share-based compensation	1,999		1,999
Issuance of common stock and stock option exercises (in shares)		296,658
Issuance of common stock and stock option exercises	0	$ 296	(296)
Ending Balance (in shares) at Jun. 30, 2025		21,560,985
Ending Balance at Jun. 30, 2025	$ 43,548	$ 21,561	$ 81,666	$ (44,870)	$ (14,809)