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Major Customers (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net $ 36,813,000 $ 53,514,000 $ 79,343,000 $ 101,368,000
Contracts Revenue 2,193,000 1,342,000 5,131,000 3,087,000
Revenue, Net 39,006,000 54,856,000 84,474,000 104,455,000
Navistar [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 10,844,000 13,493,000 21,729,000 26,301,000
Contracts Revenue 691,000 1,033,000 696,000 1,048,000
Revenue, Net 11,535,000 14,526,000 22,425,000 27,349,000
Volvo [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 8,274,000 15,011,000 17,128,000 28,640,000
Contracts Revenue 26,000 179,000 448,000 1,198,000
Revenue, Net 8,300,000 15,190,000 17,576,000 29,838,000
Paccar [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 5,395,000 9,444,000 11,547,000 19,158,000
Contracts Revenue 1,215,000 121,000 3,436,000 756,000
Revenue, Net 6,610,000 9,565,000 14,983,000 19,914,000
Yamaha [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 2,610,000 4,251,000 8,056,000 9,484,000
Contracts Revenue 0 0 0 0
Revenue, Net 2,610,000 4,251,000 8,056,000 9,484,000
Other Customers [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 9,690,000 11,315,000 20,883,000 17,785,000
Contracts Revenue 261,000 9,000 551,000 85,000
Revenue, Net $ 9,951,000 $ 11,324,000 $ 21,434,000 $ 17,870,000