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Quarterly Results of Operations (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Quarterly results of operations:                    
Total product sales $ 32,009 $ 32,149 $ 41,209 $ 44,331 $ 39,151 $ 37,173 $ 33,547 $ 28,974 $ 149,698 $ 138,845
Total tooling sales 3,687 5,532 3,335 198 2,151 663 1,747 15 12,752 4,576
Total net sales 35,696 37,681 44,544 44,529 41,302 37,836 35,294 28,989 162,450 143,421
Gross margin 6,202 4,989 7,026 7,631 7,390 8,171 7,730 6,592 25,848 29,883
Income before interest and taxes 3,076 1,957 3,439 4,018 3,968 4,754 4,553 3,669 12,490 16,944
Net income $ 2,063 $ 1,151 $ 2,341 $ 2,635 $ 2,559 $ 2,856 $ 2,842 $ 2,269 $ 8,190 $ 10,526
Net income per common share:                    
Basic (USD per share) $ 0.29 $ 0.16 $ 0.33 $ 0.37 $ 0.36 $ 0.41 $ 0.41 $ 0.33 $ 1.15 $ 1.51
Diluted (USD per share) $ 0.28 $ 0.16 $ 0.32 $ 0.36 $ 0.35 $ 0.39 $ 0.39 $ 0.31 $ 1.11 $ 1.44