Segment Information - Summary of financial results for reportable segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Sales	$ 60,636	$ 60,461
Operating Income (Loss)	2,459	3,716
Unallocated
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Sales	0	0
Operating Income (Loss)	(1,989)	(2,142)
NAI
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Sales	34,535	36,484
NAI | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Sales	19,470	22,371
Operating Income (Loss)	(683)	700
NAI | Intercompany sales
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Intercompany sales	334	652
INI | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Sales	25,374	23,299
Operating Income (Loss)	2,760	2,880
INI | Intercompany sales
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Intercompany sales	3,475	4,626
GTM | Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Sales	15,792	14,791
Operating Income (Loss)	2,371	2,278
Intercompany sales	78	275
GTM | Intercompany sales
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Intercompany sales	$ 202	$ 409