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Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Net sales:        
Products $ 33,546,727 $ 21,473,293 $ 62,521,147 $ 41,169,225
Tooling 1,747,018 2,002,499 1,761,899 2,748,607
Total sales 35,293,745 23,475,792 64,283,046 43,917,832
Total cost of sales 27,564,114 20,056,987 49,961,168 36,415,103
Gross margin 7,729,631 3,418,805 14,321,878 7,502,729
Total selling, general and administrative expense 3,176,768 2,293,334 6,100,020 4,619,270
Income before interest and taxes 4,552,863 1,125,471 8,221,858 2,883,459
Interest expense 267,262 457,290 448,650 877,473
Income before income taxes 4,285,601 668,181 7,773,208 2,005,986
Income tax expense 1,443,710 226,878 2,661,966 1,701,625
Net income $ 2,841,891 $ 441,303 $ 5,111,242 $ 304,361
Net income per common share:        
Basic $ 0.41 $ 0.06 $ 0.74 $ 0.04
Diluted $ 0.39 $ 0.06 $ 0.70 $ 0.04
Weighted average shares outstanding:        
Basic 6,906,714 6,817,365 6,899,496 6,808,542
Diluted 7,333,147 7,078,959 7,286,971 7,132,176