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Major Customers (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Revenue, Major Customer [Line Items]        
Total product sales $ 41,209,000 $ 33,547,000 $ 85,540,000 $ 62,521,000
Total tooling sales 3,335,000 1,747,000 3,533,000 1,762,000
Total sales 44,544,000 35,294,000 89,073,000 64,283,000
Navistar [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 16,018,000 15,567,000 32,892,000 29,339,000
Paccar [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 15,278,000 12,669,000 31,811,000 21,697,000
Other Customers [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 13,248,000 7,058,000 24,370,000 13,247,000
Product Sales [Member] | Navistar [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 15,055,000 14,739,000 31,854,000 28,511,000
Product Sales [Member] | Paccar [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 15,082,000 12,446,000 31,521,000 21,474,000
Product Sales [Member] | Other Customers [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 11,072,000 6,362,000 22,165,000 12,536,000
Tooling Sales [Member] | Navistar [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 963,000 828,000 1,038,000 828,000
Tooling Sales [Member] | Paccar [Member]
        
Revenue, Major Customer [Line Items]        
Total sales 196,000 223,000 290,000 223,000
Tooling Sales [Member] | Other Customers [Member]
        
Revenue, Major Customer [Line Items]        
Total sales $ 2,176,000 $ 696,000 $ 2,205,000 $ 711,000