Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock Outstanding Class A	Common Stock Outstanding Class B	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Jun. 30, 2018	$ 87,871	$ 6,302	$ 720	$ 55,641	$ 74,368	$ (49,160)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive (loss) income	(4,002)				6,079	(10,081)
Transfer of historical translation adjustment	0				40	(40)
Repurchase of shares	(950)	(154)	(5)	(791)
Issuance of stock	81		15	66
Stock-based compensation	379	19		360
Conversion		40	(40)
Ending balance at Jun. 30, 2019	83,379	6,207	690	55,276	80,487	(59,281)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive (loss) income	(37,973)				(21,839)	(16,134)
Repurchase of shares	(26)		(6)	(20)
Issuance of stock	73		21	52
Stock-based compensation	530	76		454
Conversion		25	(25)
Ending balance at Jun. 30, 2020	45,983	6,308	680	55,762	58,648	(75,415)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total	(75,415)
Total comprehensive (loss) income	36,686				15,533	21,153
Repurchase of shares	(32)		(6)	(26)
Issuance of stock	75		16	59
Stock-based compensation	823	111		712
Conversion		56	(56)
Ending balance at Jun. 30, 2021	83,535	$ 6,475	$ 634	$ 56,507	$ 74,181	(54,262)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Currency translation loss, net of taxes						(56,046)
Pension and postretirement plans, net of taxes						1,784
Total	$ (54,262)					$ (54,262)