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, 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)
Issuance of stock	117	7	8	102
Stock-based compensation	237	11		226
Conversion		7	(7)
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)
Accumulated other comprehensive loss	(51,066)
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)