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Major Customers (Details) (USD $)	3 Months Ended												12 Months Ended
Major Customers (Details) (USD $)	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Major customers:
Total product sales	$ 42,592,000us-gaap_SalesRevenueGoodsNet	$ 43,171,000us-gaap_SalesRevenueGoodsNet	$ 43,317,000us-gaap_SalesRevenueGoodsNet	$ 40,664,000us-gaap_SalesRevenueGoodsNet	$ 36,750,000us-gaap_SalesRevenueGoodsNet	$ 32,342,000us-gaap_SalesRevenueGoodsNet	$ 32,146,000us-gaap_SalesRevenueGoodsNet	$ 32,858,000us-gaap_SalesRevenueGoodsNet	$ 32,009,000us-gaap_SalesRevenueGoodsNet	$ 32,149,000us-gaap_SalesRevenueGoodsNet	$ 41,209,000us-gaap_SalesRevenueGoodsNet	$ 44,331,000us-gaap_SalesRevenueGoodsNet	$ 169,744,000us-gaap_SalesRevenueGoodsNet	$ 134,096,000us-gaap_SalesRevenueGoodsNet	$ 149,698,000us-gaap_SalesRevenueGoodsNet
Total tooling sales	1,822,000us-gaap_ContractsRevenue	420,000us-gaap_ContractsRevenue	2,807,000us-gaap_ContractsRevenue	411,000us-gaap_ContractsRevenue	898,000us-gaap_ContractsRevenue	5,092,000us-gaap_ContractsRevenue	2,535,000us-gaap_ContractsRevenue	1,504,000us-gaap_ContractsRevenue	3,687,000us-gaap_ContractsRevenue	5,532,000us-gaap_ContractsRevenue	3,335,000us-gaap_ContractsRevenue	198,000us-gaap_ContractsRevenue	5,460,000us-gaap_ContractsRevenue	10,029,000us-gaap_ContractsRevenue	12,752,000us-gaap_ContractsRevenue
Total net sales	44,414,000us-gaap_SalesRevenueNet	43,591,000us-gaap_SalesRevenueNet	46,124,000us-gaap_SalesRevenueNet	41,075,000us-gaap_SalesRevenueNet	37,648,000us-gaap_SalesRevenueNet	37,434,000us-gaap_SalesRevenueNet	34,681,000us-gaap_SalesRevenueNet	34,362,000us-gaap_SalesRevenueNet	35,696,000us-gaap_SalesRevenueNet	37,681,000us-gaap_SalesRevenueNet	44,544,000us-gaap_SalesRevenueNet	44,529,000us-gaap_SalesRevenueNet	175,204,000us-gaap_SalesRevenueNet	144,125,000us-gaap_SalesRevenueNet	162,450,000us-gaap_SalesRevenueNet
Navistar
Major customers:
Total net sales													51,330,000	47,356,000	63,303,000
Volvo [Member]
Major customers:
Total net sales													48,859,000	12,444,000	6,228,000
Paccar
Major customers:
Total net sales													36,128,000	50,154,000	57,252,000
Yamaha [Member]
Major customers:
Total net sales													16,911,000	13,648,000	12,623,000
Other customers
Major customers:
Total net sales													21,976,000	20,523,000	23,044,000
Product sales
Major customers:
Total net sales													169,744,000	134,096,000	149,698,000
Product sales \| Navistar
Major customers:
Total net sales													51,254,000	46,384,000	55,002,000
Product sales \| Volvo [Member]
Major customers:
Total net sales													46,340,000	11,508,000	6,195,000
Product sales \| Paccar
Major customers:
Total net sales													35,602,000	42,784,000	55,524,000
Product sales \| Yamaha [Member]
Major customers:
Total net sales													16,911,000	13,648,000	12,619,000
Product sales \| Other customers
Major customers:
Total net sales													19,637,000	19,772,000	20,358,000
Tooling sales
Major customers:
Total net sales													5,460,000	10,029,000	12,752,000
Tooling sales \| Navistar
Major customers:
Total net sales													76,000	972,000	8,301,000
Tooling sales \| Volvo [Member]
Major customers:
Total net sales													2,519,000	936,000	33,000
Tooling sales \| Paccar
Major customers:
Total net sales													526,000	7,370,000	1,728,000
Tooling sales \| Yamaha [Member]
Major customers:
Total net sales													0	0	4,000
Tooling sales \| Other customers
Major customers:
Total net sales													$ 2,339,000	$ 751,000	$ 2,686,000