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Major Customers (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Revenue, Major Customer [Line Items]        
Total product sales $ 32,342,000 $ 32,149,000 $ 97,346,000 $ 117,689,000
Total tooling sales 5,092,000 5,532,000 9,131,000 9,065,000
Total sales 37,434,000 37,681,000 106,477,000 126,754,000
Navistar [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 11,501,000 17,358,000 36,308,000 50,250,000
Paccar [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 16,887,000 12,547,000 40,948,000 44,358,000
Other Customers [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 9,046,000 7,776,000 29,221,000 32,146,000
Product Sales [Member] | Navistar [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 11,330,000 11,902,000 35,548,000 43,756,000
Product Sales [Member] | Paccar [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 12,044,000 12,507,000 33,896,000 44,028,000
Product Sales [Member] | Other Customers [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 8,968,000 7,740,000 27,902,000 29,905,000
Tooling Sales [Member] | Navistar [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 171,000 5,456,000 760,000 6,494,000
Tooling Sales [Member] | Other Customers [Member]
        
Revenue, Major Customer [Line Items]        
Total sales $ 78,000 $ 36,000 $ 1,319,000 $ 2,241,000