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Major Customers (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
customer
Mar. 31, 2020
USD ($)
Revenue, Major Customer [Line Items]    
Number of major customers | customer 5  
Net sales $ 72,829 $ 64,023
Product    
Revenue, Major Customer [Line Items]    
Net sales 69,133 61,930
Tooling    
Revenue, Major Customer [Line Items]    
Net sales 3,696 2,093
UFP    
Revenue, Major Customer [Line Items]    
Net sales 10,657 8,987
UFP | Product    
Revenue, Major Customer [Line Items]    
Net sales 10,657 8,987
UFP | Tooling    
Revenue, Major Customer [Line Items]    
Net sales 0 0
Navistar    
Revenue, Major Customer [Line Items]    
Net sales 10,243 10,765
Navistar | Product    
Revenue, Major Customer [Line Items]    
Net sales 9,937 10,667
Navistar | Tooling    
Revenue, Major Customer [Line Items]    
Net sales 306 98
Volvo    
Revenue, Major Customer [Line Items]    
Net sales 10,145 9,098
Volvo | Product    
Revenue, Major Customer [Line Items]    
Net sales 10,125 7,573
Volvo | Tooling    
Revenue, Major Customer [Line Items]    
Net sales 20 1,525
PACCAR    
Revenue, Major Customer [Line Items]    
Net sales 9,683 8,156
PACCAR | Product    
Revenue, Major Customer [Line Items]    
Net sales 9,354 7,949
PACCAR | Tooling    
Revenue, Major Customer [Line Items]    
Net sales 329 207
BRP    
Revenue, Major Customer [Line Items]    
Net sales 8,683 7,467
BRP | Product    
Revenue, Major Customer [Line Items]    
Net sales 8,568 7,247
BRP | Tooling    
Revenue, Major Customer [Line Items]    
Net sales 115 220
Other Customers    
Revenue, Major Customer [Line Items]    
Net sales 23,418 19,550
Other Customers | Product    
Revenue, Major Customer [Line Items]    
Net sales 20,492 19,507
Other Customers | Tooling    
Revenue, Major Customer [Line Items]    
Net sales $ 2,926 $ 43