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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Net sales $ 8,537,639 $ 7,821,606 $ 26,167,158 $ 23,770,078
Cost of goods sold 6,612,846 6,075,288 20,268,027 18,650,568
Gross profit 1,924,793 1,746,318 5,899,131 5,119,510
Selling and administrative expenses 1,263,236 1,288,872 3,934,872 3,832,380
Operating profit 661,557 457,446 1,964,259 1,287,130
Other income:        
Interest income 8,185 9,794 24,870 32,812
Gain from the disposal of property and equipment   800 57,500 189,863
Other nonoperating income 3,600 3,600 11,879 11,378
Income before provision for income taxes 673,342 471,640 2,058,508 1,521,183
Provision for income taxes 210,000 154,000 661,000 499,000
Net income $ 463,342 $ 317,640 $ 1,397,508 $ 1,022,183
Average common shares outstanding 966,132 966,132 966,132 966,132
Earnings per share $ 0.48 $ 0.33 $ 1.45 $ 1.06
Cash dividends declared per share $ 0.15 $ 0.12 $ 0.45 $ 0.36