Business Segments - Narrative (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Jun. 21, 2022 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) segment	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Segment Reporting Information
Number of operating segments | segment				2
Number of reportable segments | segment				2
Gain on sale of former joint venture facility		$ 0	$ 0	$ 0	$ 3,477
Deferred payment for Skratch acquisition				782	0
Total net sales		138,286	137,466	379,636	402,582
Exit costs				655	0
Restructuring reserve		233		233		$ 687
AMH
Segment Reporting Information
Exit costs				1,351
Inventory and fixed asset write-down				655
Personnel expenses				507
Other exit costs				189
AMH | Automation and Materials Handling Line
Segment Reporting Information
Total net sales		530	907	1,750	4,230
August 2024 Restructuring
Segment Reporting Information
Restructuring reserve						$ 687
Skratch acquisition
Segment Reporting Information
Payments to acquire businesses	$ 7,402
Business combination, deferred consideration	$ 1,228
Business combination, term for payment of deferred consideration	5 years
Deferred payment for Skratch acquisition				782
Cost of Goods Sold | AMH
Segment Reporting Information
Exit costs				1,085
Selling and Administrative Expenses | AMH
Segment Reporting Information
Exit costs				266
Discontinued Operations | Bridge Grid Deck Product
Segment Reporting Information
Total net sales		$ 94	$ 921	1,093	2,888
Corporate And Reconciling Items
Segment Reporting Information
Gain on sale of former joint venture facility				$ 0	$ 3,477