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)
Accumulated balance consists of:
Translation loss						(62,110)
Pension and postretirement plans, net of taxes						(13,563)
Accumulated other comprehensive loss						(75,673)
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	0	25	(25)
Ending balance at Sep. 30, 2021	83,248	$ 6,619	$ 607	$ 56,548	$ 77,413	(57,939)
Accumulated balance consists of:
Translation loss						(59,657)
Pension and postretirement plans, net of taxes						1,718
Accumulated other comprehensive loss	$ (57,939)					$ (57,939)