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Condensed Consolidated Statements of Income (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Condensed Consolidated Statements of Income        
Net sales $ 34,700,192 $ 31,966,826 $ 104,229,431 $ 97,591,654
Cost of sales 24,537,759 22,740,944 74,445,793 69,473,855
Gross profit 10,162,433 9,225,882 29,783,638 28,117,799
Selling, general & administrative expenses 5,678,614 5,155,712 17,699,636 16,065,994
Loss (Gain) on sale of fixed assets     11,207 (12,363)
Operating income 4,483,819 4,070,170 12,072,795 12,064,168
Interest expense, net (42,981) (13,739) (128,166) (43,247)
Other expenses       (2,058)
Income before income tax expense 4,440,838 4,056,431 11,944,629 12,018,863
Income tax expense 1,554,293 1,460,158 4,045,619 4,326,790
Net income $ 2,886,545 $ 2,596,273 $ 7,899,010 $ 7,692,073
Net income per share:        
Basic (in dollars per share) $ 0.42 $ 0.39 $ 1.16 $ 1.15
Diluted (in dollars per share) $ 0.41 $ 0.37 $ 1.11 $ 1.09
Weighted average common shares outstanding:        
Basic (in shares) 6,839,556 6,720,756 6,802,245 6,667,895
Diluted (in shares) 7,111,849 7,074,631 7,095,851 7,055,397