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Condensed Consolidated Statements of Income (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Condensed Consolidated Statements of Income        
Net sales $ 35,832,225 $ 33,672,605 $ 69,529,239 $ 65,624,828
Cost of sales 25,113,226 23,982,050 49,908,034 46,732,911
Gross profit 10,718,999 9,690,555 19,621,205 18,891,917
Selling, general & administrative expenses 6,075,073 5,391,757 12,021,022 10,910,282
(Gain) loss on sale of fixed assets 11,207 (6,900) 11,207 (12,363)
Operating income 4,632,719 4,305,698 7,588,976 7,993,998
Interest expense, net (44,685) (14,000) (85,185) (29,508)
Other expenses       (2,058)
Income before income tax expense 4,588,034 4,291,698 7,503,791 7,962,432
Income tax expense 1,605,812 1,544,632 2,491,326 2,866,632
Net income $ 2,982,222 $ 2,747,066 $ 5,012,465 $ 5,095,800
Net income per share:        
Basic (in dollars per share) $ 0.44 $ 0.41 $ 0.74 $ 0.77
Diluted (in dollars per share) $ 0.42 $ 0.39 $ 0.71 $ 0.72
Weighted average common shares outstanding:        
Basic (in shares) 6,798,151 6,693,981 6,783,362 6,641,174
Diluted (in shares) 7,090,434 7,055,017 7,088,950 7,046,299