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Consolidated Statements of Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Consolidated Statements of Earnings [Abstract] |  |  |
Net sales | $ 291,867 | $ 255,071 | $ 219,438
Cost of sales | 205,866 | 177,034 | 152,480
Gross margin | 86,001 | 78,037 | 66,958
Operating expenses: |  |  |
Selling expenses | 16,284 | 15,608 | 14,350
Research and development expenses | 2,890 | 3,190 | 3,298
General and administrative expenses | 10,602 | 9,469 | 8,651
Total operating expenses | 29,776 | 28,267 | 26,299
Earnings from operations | 56,225 | 49,770 | 40,659
Other expenses (income): |  |  |
Interest income | (184) | (289) | (107)
Interest expense | 84 | 90 | 209
Other, net | (413) | (162) | (45)
Earnings before income tax expense | 56,738 | 50,131 | 40,602
Income tax expense | 17,973 | 16,854 | 13,817
Net earnings | $ 38,765 | $ 33,277 | $ 26,785
Net earnings per common share - basic (in dollars per share) | $ 1.36 | $ 1.19 | $ 0.98
Net diluted earnings per common share - diluted (in dollars per share) | $ 1.28 | $ 1.12 | $ 0.93

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