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Major Customers (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Revenue, Major Customer [Line Items]        
Total product sales $ 32,149,000 $ 37,173,000 $ 117,689,000 $ 99,694,000
Total tooling sales 5,532,000 663,000 9,065,000 2,425,000
Total sales 37,681,000 37,836,000 126,754,000 102,119,000
Navistar [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 17,358,000 17,968,000 50,250,000 47,307,000
Paccar [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 12,547,000 12,881,000 44,358,000 34,578,000
Other Customers [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 7,776,000 6,987,000 32,146,000 20,234,000
Product Sales [Member] | Navistar [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 11,902,000 17,643,000 43,756,000 46,155,000
Product Sales [Member] | Paccar [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 12,507,000 12,754,000 44,028,000 34,227,000
Product Sales [Member] | Other Customers [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 7,740,000 6,776,000 29,905,000 19,312,000
Tooling Sales [Member] | Navistar [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 5,456,000 325,000 6,494,000 1,152,000
Tooling Sales [Member] | Paccar [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 40,000 127,000 330,000 351,000
Tooling Sales [Member] | Other Customers [Member]
        
Revenue, Major Customer [Line Items]        
Total sales $ 36,000 $ 211,000 $ 2,241,000 $ 922,000