Major Customers (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) customer	Jun. 30, 2022 USD ($)
Revenue, Major Customer [Line Items]
Number of major customers | customer			5
Net sales	$ 97,725	$ 98,735	$ 197,232	$ 189,326
Product
Revenue, Major Customer [Line Items]
Net sales	95,703	93,317	194,040	183,218
Tooling
Revenue, Major Customer [Line Items]
Net sales	2,022	5,418	3,192	6,108
UFP
Revenue, Major Customer [Line Items]
Net sales	9,157	11,856	19,932	24,543
UFP | Product
Revenue, Major Customer [Line Items]
Net sales	9,157	11,856	19,932	24,543
UFP | Tooling
Revenue, Major Customer [Line Items]
Net sales	0	0	0	0
Navistar
Revenue, Major Customer [Line Items]
Net sales	17,751	16,370	37,197	30,402
Navistar | Product
Revenue, Major Customer [Line Items]
Net sales	17,751	14,110	37,012	28,132
Navistar | Tooling
Revenue, Major Customer [Line Items]
Net sales	0	2,260	185	2,270
Volvo
Revenue, Major Customer [Line Items]
Net sales	16,117	11,885	31,770	22,887
Volvo | Product
Revenue, Major Customer [Line Items]
Net sales	15,362	11,885	30,971	22,800
Volvo | Tooling
Revenue, Major Customer [Line Items]
Net sales	755	0	799	87
PACCAR
Revenue, Major Customer [Line Items]
Net sales	9,383	9,233	19,652	18,090
PACCAR | Product
Revenue, Major Customer [Line Items]
Net sales	8,721	9,159	18,922	17,905
PACCAR | Tooling
Revenue, Major Customer [Line Items]
Net sales	662	74	730	185
BRP
Revenue, Major Customer [Line Items]
Net sales	12,614	14,685	25,339	27,042
BRP | Product
Revenue, Major Customer [Line Items]
Net sales	12,457	14,498	24,601	26,705
BRP | Tooling
Revenue, Major Customer [Line Items]
Net sales	157	187	738	337
Other Customers
Revenue, Major Customer [Line Items]
Net sales	32,703	34,706	63,342	66,362
Other Customers | Product
Revenue, Major Customer [Line Items]
Net sales	32,255	31,809	62,602	63,133
Other Customers | Tooling
Revenue, Major Customer [Line Items]
Net sales	$ 448	$ 2,897	$ 740	$ 3,229