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Major Customers (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Revenue, Major Customer [Line Items]        
Number of Major Customers     5  
Revenues $ 37,806,000 $ 81,247,000 $ 101,830,000 $ 153,513,000
Product [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 35,847,000 75,440,000 97,777,000 146,892,000
Service [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 1,959,000 5,807,000 4,053,000 6,621,000
Navistar [Member]        
Revenue, Major Customer [Line Items]        
Revenues 7,588,000 17,786,000 18,352,000 32,078,000
Navistar [Member] | Product [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 6,500,000 17,043,000 17,166,000 31,296,000
Navistar [Member] | Service [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 1,088,000 743,000 1,186,000 782,000
Volvo [Member]        
Revenue, Major Customer [Line Items]        
Revenues 2,789,000 14,613,000 11,887,000 29,235,000
Volvo [Member] | Product [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 2,167,000 14,581,000 9,740,000 29,096,000
Volvo [Member] | Service [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 622,000 32,000 2,147,000 139,000
Universal Forest Products [Member]        
Revenue, Major Customer [Line Items]        
Revenues 9,484,000 9,203,000 18,471,000 15,325,000
Universal Forest Products [Member] | Product [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 9,484,000 9,203,000 18,471,000 15,325,000
Universal Forest Products [Member] | Service [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0
Paccar [Member]        
Revenue, Major Customer [Line Items]        
Revenues 3,167,000 13,422,000 11,323,000 25,407,000
Paccar [Member] | Product [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 3,167,000 12,435,000 11,116,000 24,247,000
Paccar [Member] | Service [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 0 987,000 207,000 1,160,000
BRP [Member]        
Revenue, Major Customer [Line Items]        
Revenues 2,319,000 2,467,000 9,786,000 8,106,000
BRP [Member] | Product [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 2,206,000 2,429,000 9,453,000 7,977,000
BRP [Member] | Service [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 113,000 38,000 333,000 129,000
Other Customers [Member]        
Revenue, Major Customer [Line Items]        
Revenues 12,459,000 23,756,000 32,011,000 43,362,000
Other Customers [Member] | Product [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 12,323,000 19,749,000 31,831,000 38,951,000
Other Customers [Member] | Service [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax $ 136,000 $ 4,007,000 $ 180,000 $ 4,411,000