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Major Customers (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenue, Major Customer [Line Items]        
Revenues $ 81,247,000 $ 68,601,000 $ 153,513,000 $ 131,647,000
Navistar [Member]        
Revenue, Major Customer [Line Items]        
Revenues 17,786,000 12,878,000 32,078,000 23,829,000
Volvo [Member]        
Revenue, Major Customer [Line Items]        
Revenues 14,613,000 12,031,000 29,235,000 22,228,000
Paccar [Member]        
Revenue, Major Customer [Line Items]        
Revenues 13,422,000 11,397,000 25,407,000 21,363,000
UFP [Member]        
Revenue, Major Customer [Line Items]        
Revenues 9,203,000 8,450,000 15,325,000 14,049,000
Revenue from Contract with Customer, Including Assessed Tax 9,203,000 8,450,000 15,325,000 14,049,000
Other Customers [Member]        
Revenue, Major Customer [Line Items]        
Revenues 26,223,000 23,845,000 51,468,000 50,178,000
Product [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 75,440,000 65,225,000 146,892,000 124,937,000
Product [Member] | Navistar [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 17,043,000 12,866,000 31,296,000 23,817,000
Product [Member] | Volvo [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 14,581,000 11,988,000 29,096,000 22,185,000
Product [Member] | Paccar [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 12,435,000 8,537,000 24,247,000 15,300,000
Product [Member] | Other Customers [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 22,178,000 23,384,000 46,928,000 49,586,000
Service [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 5,807,000 3,376,000 6,621,000 6,710,000
Service [Member] | Navistar [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 743,000 12,000 782,000 12,000
Service [Member] | Volvo [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 32,000 43,000 139,000 43,000
Service [Member] | Paccar [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 987,000 2,860,000 1,160,000 6,063,000
Service [Member] | UFP [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0
Service [Member] | Other Customers [Member]        
Revenue, Major Customer [Line Items]        
Revenue from Contract with Customer, Including Assessed Tax $ 4,045,000 $ 461,000 $ 4,540,000 $ 592,000