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Major Customers (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Revenue, Major Customer [Line Items]    
Total product sales $ 32,858,000 $ 44,331,000
Total tooling sales 1,504,000 198,000
Total sales 34,362,000 44,529,000
Navistar [Member]
    
Revenue, Major Customer [Line Items]    
Total sales 12,267,000 16,874,000
Paccar [Member]
    
Revenue, Major Customer [Line Items]    
Total sales 11,471,000 16,533,000
Yamaha [Member]
    
Revenue, Major Customer [Line Items]    
Total sales 4,007,000 4,199,000
Other Customers [Member]
    
Revenue, Major Customer [Line Items]    
Total sales 6,617,000 6,923,000
Product Sales [Member] | Navistar [Member]
    
Revenue, Major Customer [Line Items]    
Total sales 12,238,000 16,799,000
Product Sales [Member] | Paccar [Member]
    
Revenue, Major Customer [Line Items]    
Total sales 10,822,000 16,439,000
Product Sales [Member] | Yamaha [Member]
    
Revenue, Major Customer [Line Items]    
Total sales 4,007,000 4,199,000
Product Sales [Member] | Other Customers [Member]
    
Revenue, Major Customer [Line Items]    
Total sales 5,791,000 6,894,000
Tooling Sales [Member] | Navistar [Member]
    
Revenue, Major Customer [Line Items]    
Total sales 29,000 75,000
Tooling Sales [Member] | Paccar [Member]
    
Revenue, Major Customer [Line Items]    
Total sales 649,000 94,000
Tooling Sales [Member] | Yamaha [Member]
    
Revenue, Major Customer [Line Items]    
Total sales 0 0
Tooling Sales [Member] | Other Customers [Member]
    
Revenue, Major Customer [Line Items]    
Total sales $ 826,000 $ 29,000