Condensed 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, 2022	$ 102,429	$ 6,683	$ 610	$ 57,143	$ 89,059	$ (51,066)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	(775)				2,056	(2,831)
Repurchase of shares	(6)		(1)	(5)
Stock-based compensation	185	76		109
Conversion		12	(12)
Ending balance at Sep. 30, 2022	101,833	6,771	597	57,247	91,115	(53,897)
Beginning balance at Jun. 30, 2022	102,429	6,683	610	57,143	89,059	(51,066)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	5,036
Ending balance at Dec. 31, 2022	107,910	6,803	624	57,454	94,246	(51,217)
Beginning balance at Sep. 30, 2022	101,833	6,771	597	57,247	91,115	(53,897)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	5,811				3,131	2,680
Repurchase of shares	(3)			(3)
Issuance of stock	84	0	34	50
Stock-based compensation	185	25		160
Conversion		7	(7)
Ending balance at Dec. 31, 2022	107,910	6,803	624	57,454	94,246	(51,217)
Accumulated balance consists of:
Translation loss						(60,166)
Pension and postretirement plans, net of taxes						8,949
Accumulated other comprehensive loss	(51,217)
Accumulated other comprehensive loss	(47,935)
Beginning balance at Jun. 30, 2023	129,467	6,854	576	57,825	112,147	(47,935)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	(519)				1,920	(2,439)
Repurchase of shares	(23)		(2)	(21)
Stock-based compensation	65	56		9
Conversion		23	(23)
Ending balance at Sep. 30, 2023	128,990	6,933	551	57,813	114,067	(50,374)
Beginning balance at Jun. 30, 2023	129,467	6,854	576	57,825	112,147	(47,935)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	1,358
Ending balance at Dec. 31, 2023	131,126	6,954	552	58,050	113,672	(48,102)
Beginning balance at Sep. 30, 2023	128,990	6,933	551	57,813	114,067	(50,374)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	1,878				(394)	2,272
Repurchase of shares	(3)			(3)
Issuance of stock	40	0	5	35
Stock-based compensation	222	17		205
Conversion		4	(4)
Ending balance at Dec. 31, 2023	131,126	$ 6,954	$ 552	$ 58,050	$ 113,672	(48,102)
Accumulated balance consists of:
Translation loss						(55,937)
Pension and postretirement plans, net of taxes						$ 7,835
Accumulated other comprehensive loss	$ (48,102)