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Major Customers (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
USD ($)
customer
Mar. 31, 2021
USD ($)
Revenue, Major Customer [Line Items]    
Number of major customers | customer 5  
Net sales $ 90,592 $ 72,829
Product    
Revenue, Major Customer [Line Items]    
Net sales 89,901 69,133
Tooling    
Revenue, Major Customer [Line Items]    
Net sales 691 3,696
UFP    
Revenue, Major Customer [Line Items]    
Net sales 12,687 10,657
UFP | Product    
Revenue, Major Customer [Line Items]    
Net sales 12,687 10,657
UFP | Tooling    
Revenue, Major Customer [Line Items]    
Net sales 0 0
Navistar    
Revenue, Major Customer [Line Items]    
Net sales 14,033 10,243
Navistar | Product    
Revenue, Major Customer [Line Items]    
Net sales 14,022 9,937
Navistar | Tooling    
Revenue, Major Customer [Line Items]    
Net sales 11 306
Volvo    
Revenue, Major Customer [Line Items]    
Net sales 11,002 10,145
Volvo | Product    
Revenue, Major Customer [Line Items]    
Net sales 10,915 10,125
Volvo | Tooling    
Revenue, Major Customer [Line Items]    
Net sales 87 20
PACCAR    
Revenue, Major Customer [Line Items]    
Net sales 8,858 9,683
PACCAR | Product    
Revenue, Major Customer [Line Items]    
Net sales 8,747 9,354
PACCAR | Tooling    
Revenue, Major Customer [Line Items]    
Net sales 111 329
BRP    
Revenue, Major Customer [Line Items]    
Net sales 12,357 8,683
BRP | Product    
Revenue, Major Customer [Line Items]    
Net sales 12,207 8,568
BRP | Tooling    
Revenue, Major Customer [Line Items]    
Net sales 150 115
Other Customers    
Revenue, Major Customer [Line Items]    
Net sales 31,655 23,418
Other Customers | Product    
Revenue, Major Customer [Line Items]    
Net sales 31,323 20,492
Other Customers | Tooling    
Revenue, Major Customer [Line Items]    
Net sales $ 332 $ 2,926