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, 2019	$ 83,379	$ 6,207	$ 690	$ 55,276	$ 80,487	$ (59,281)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	(2,981)				778	(3,759)
Repurchase of shares	(10)		(2)	(8)
Stock-based compensation	214	57		157
Conversion		6	(6)
Ending balance at Sep. 30, 2019	80,602	6,270	682	55,425	81,265	(63,040)
Accumulated balance consists of:
Translation loss						(53,297)
Pension and postretirement plans, net of taxes						(9,743)
Accumulated other comprehensive loss						(63,040)
Accumulated other comprehensive loss	(75,415)
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	0	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)					$ (75,673)