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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $)
3 Months Ended 9 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Sep. 28, 2013
Sep. 29, 2012
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) [Abstract]        
Net sales $ 34,256,086 $ 39,644,050 $ 108,196,240 $ 121,699,533
Cost of products sold (27,031,677) (31,478,557) (86,174,409) (96,104,184)
Gross margin 7,224,409 8,165,493 22,021,831 25,595,349
Selling and administrative expenses (4,767,505) (4,830,971) (14,671,986) (14,947,179)
Operating profit 2,456,904 3,334,522 7,349,845 10,648,170
Interest expense (78,629) (93,238) (249,481) (281,142)
Other income 8,201 3,462 36,660 14,185
Income before income taxes 2,386,476 3,244,746 7,137,024 10,381,213
Income taxes 587,693 1,020,771 2,158,699 3,479,284
Net income $ 1,798,783 $ 2,223,975 $ 4,978,325 $ 6,901,929
Earnings per share:        
Basic (in dollars per share) $ 0.29 $ 0.36 $ 0.80 $ 1.11
Diluted (in dollars per share) $ 0.29 $ 0.36 $ 0.80 $ 1.11
Cash dividends per share (in dollars per share) $ 0.11 $ 0.10 $ 0.31 $ 0.30