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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

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