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	0	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)	12,147
Ending balance at Mar. 31, 2022	96,273	6,665	594	56,948	84,225	(52,159)
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	0	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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	11,002				4,284	6,718
Repurchase of shares	(17)		(3)	(14)
Stock-based compensation	103	10		93
Conversion	0	11	(11)
Ending balance at Mar. 31, 2022	96,273	6,665	594	56,948	84,225	(52,159)
Accumulated balance consists of:
Translation loss						(53,722)
Pension and postretirement plans, net of taxes						1,563
Accumulated other comprehensive loss	(52,159)
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)	14,010
Ending balance at Mar. 31, 2023	117,056	6,818	608	57,627	101,719	(49,716)
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)
Stock-based compensation	185	25		160
Conversion		7	(7)
Issuance of stock	84	0	34	50
Ending balance at Dec. 31, 2022	107,910	6,803	624	57,454	94,246	(51,217)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	8,974				7,473	1,501
Repurchase of shares	(7)		(1)	(6)
Stock-based compensation	179			179
Conversion		15	(15)
Ending balance at Mar. 31, 2023	117,056	$ 6,818	$ 608	$ 57,627	$ 101,719	(49,716)
Accumulated balance consists of:
Translation loss						(58,621)
Pension and postretirement plans, net of taxes						$ 8,905
Accumulated other comprehensive loss	$ (49,716)