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 Loss
Beginning balance at Jun. 30, 2020	$ 45,983	$ 6,308	$ 680	$ 55,762	$ 58,648	$ (75,415)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	3,858				4,116	(258)
Repurchase of shares	(6)		(2)	(4)
Stock-based compensation	367	8		359
Conversion		26	(26)
Ending balance at Sep. 30, 2020	50,202	6,342	652	56,117	62,764	(75,673)
Beginning balance at Jun. 30, 2020	45,983	6,308	680	55,762	58,648	(75,415)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	11,562
Ending balance at Dec. 31, 2020	58,084	6,448	657	56,184	66,621	(71,826)
Beginning balance at Sep. 30, 2020	50,202	6,342	652	56,117	62,764	(75,673)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	7,704				3,857	3,847
Repurchase of shares	(1)			(1)
Stock-based compensation	154	103		51
Conversion		3	(3)
Issuance of stock	25		8	17
Ending balance at Dec. 31, 2020	58,084	6,448	657	56,184	66,621	(71,826)
Accumulated balance consists of:
Translation loss						(58,264)
Pension and postretirement plans, net of taxes						(13,562)
Accumulated other comprehensive loss	(71,826)
Accumulated other comprehensive loss	(54,262)
Beginning balance at Jun. 30, 2021	83,535	6,475	634	56,507	74,181	(54,262)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	(445)				3,232	(3,677)
Repurchase of shares	(16)		(2)	(14)
Stock-based compensation	174	119		55
Conversion		25	(25)
Ending balance at Sep. 30, 2021	83,248	6,619	607	56,548	77,413	(57,939)
Beginning balance at Jun. 30, 2021	83,535	6,475	634	56,507	74,181	(54,262)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	1,145
Ending balance at Dec. 31, 2021	85,185	6,644	608	56,869	79,941	(58,877)
Beginning balance at Sep. 30, 2021	83,248	6,619	607	56,548	77,413	(57,939)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	1,590				2,528	(938)
Repurchase of shares	(7)			(7)
Stock-based compensation	237	11		226
Conversion		7	(7)
Issuance of stock	117	7	8	102
Ending balance at Dec. 31, 2021	85,185	$ 6,644	$ 608	$ 56,869	$ 79,941	(58,877)
Accumulated balance consists of:
Translation loss						(60,528)
Pension and postretirement plans, net of taxes						$ 1,651
Accumulated other comprehensive loss	$ (58,877)