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Major Customers (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net $ 65,225,000 $ 36,794,000 $ 124,937,000 $ 73,130,000
Contracts Revenue 3,376,000 10,574,000 6,710,000 10,984,000
Total net sales 68,601,000 47,368,000 131,647,000 84,114,000
Navistar [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 12,866,000 9,919,000 23,817,000 19,175,000
Contracts Revenue 12,000 60,000 12,000 78,000
Total net sales 12,878,000 9,979,000 23,829,000 19,253,000
Volvo [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 11,988,000 7,548,000 22,185,000 12,783,000
Contracts Revenue 43,000 7,548,000 43,000 7,579,000
Total net sales 12,031,000 15,096,000 22,228,000 20,362,000
Paccar [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 8,537,000 6,391,000 15,300,000 11,852,000
Contracts Revenue 2,860,000 2,692,000 6,063,000 2,882,000
Total net sales 11,397,000 9,083,000 21,363,000 14,734,000
Yamaha [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 8,450,000 0 14,049,000 0
Contracts Revenue 0 0 0 0
Total net sales 8,450,000 0 14,049,000 0
Other Customers [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 23,384,000 12,936,000 49,586,000 29,320,000
Contracts Revenue 461,000 274,000 592,000 445,000
Total net sales $ 23,845,000 $ 13,210,000 $ 50,178,000 $ 29,765,000