XML 42 R31.htm IDEA: XBRL DOCUMENT v3.8.0.1
Major Customers (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net $ 37,593,000 $ 33,816,000 $ 110,723,000 $ 113,159,000
Contracts Revenue 901,000 7,520,000 11,885,000 12,651,000
Revenue, Net 38,494,000 41,336,000 122,608,000 125,810,000
Navistar [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 11,319,000 9,575,000 30,495,000 31,304,000
Contracts Revenue 12,000 470,000 90,000 1,166,000
Revenue, Net 11,331,000 10,045,000 30,585,000 32,470,000
Volvo [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 7,261,000 6,337,000 20,044,000 23,465,000
Contracts Revenue 432,000 5,353,000 8,011,000 5,801,000
Revenue, Net 7,693,000 11,690,000 28,055,000 29,266,000
Paccar [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 7,316,000 6,887,000 19,168,000 18,434,000
Contracts Revenue 50,000 18,000 2,932,000 3,454,000
Revenue, Net 7,366,000 6,905,000 22,100,000 21,888,000
BRP [Member] [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 2,052,000 1,437,000 10,453,000 7,803,000
Contracts Revenue 406,000 1,624,000 514,000 1,624,000
Revenue, Net 2,458,000 3,061,000 10,967,000 9,427,000
Yamaha [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 3,723,000 3,602,000 11,847,000 11,658,000
Contracts Revenue 0 0 0 0
Revenue, Net 3,723,000 3,602,000 11,847,000 11,658,000
Other Customers [Member]        
Revenue, Major Customer [Line Items]        
Sales Revenue, Goods, Net 5,922,000 5,978,000 18,716,000 20,495,000
Contracts Revenue 1,000 55,000 338,000 606,000
Revenue, Net $ 5,923,000 $ 6,033,000 $ 19,054,000 $ 21,101,000