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Major Customers (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net $ 36,794,000 $ 36,813,000 $ 73,130,000 $ 79,343,000
Contracts Revenue 10,574,000 2,193,000 10,984,000 5,131,000
Revenue, Net 47,368,000 39,006,000 84,114,000 84,474,000
Navistar [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 9,919,000 10,844,000 19,175,000 21,729,000
Contracts Revenue 60,000 691,000 78,000 696,000
Revenue, Net 9,979,000 11,535,000 19,253,000 22,425,000
Volvo [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 7,548,000 8,274,000 12,783,000 17,128,000
Contracts Revenue 7,548,000 26,000 7,579,000 448,000
Revenue, Net 15,096,000 8,300,000 20,362,000 17,576,000
Paccar [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 6,391,000 5,395,000 11,852,000 11,547,000
Contracts Revenue 2,692,000 1,215,000 2,882,000 3,436,000
Revenue, Net 9,083,000 6,610,000 14,734,000 14,983,000
BRP [Member] [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 3,690,000 2,417,000 8,401,000 6,366,000
Contracts Revenue 85,000 0 108,000 0
Revenue, Net 3,775,000 2,417,000 8,509,000 6,366,000
Yamaha [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 2,811,000 2,610,000 8,124,000 8,056,000
Contracts Revenue 0 0 0 0
Revenue, Net 2,811,000 2,610,000 8,124,000 8,056,000
Other Customers [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 6,435,000 7,273,000 12,795,000 14,517,000
Contracts Revenue 189,000 261,000 337,000 551,000
Revenue, Net $ 6,624,000 $ 7,534,000 $ 13,132,000 $ 15,068,000