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Condensed Consolidated Statements of Income (Unaudited) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Condensed Consolidated Statements of Income        
Net sales $ 9,500,678 $ 9,327,643 $ 19,451,102 $ 18,453,379
Cost of goods sold 7,261,871 7,115,077 14,966,987 14,230,552
Gross profit 2,238,807 2,212,566 4,484,115 4,222,827
Selling and administrative expenses 1,379,886 1,328,927 2,793,938 2,680,741
Operating profit 858,921 883,639 1,690,177 1,542,086
Other income:        
Interest income 6,345 7,000 12,862 15,485
Gain from disposal of equipment 1,700 42,486 18,700 42,486
Other nonoperating income 4,088 4,088 7,688 7,688
Income before provision for income taxes 871,054 937,213 1,729,427 1,607,745
Provision for income taxes 302,000 299,000 592,000 516,000
Net income $ 569,054 $ 638,213 $ 1,137,427 $ 1,091,745
Earnings per share $ 0.59 $ 0.66 $ 1.18 $ 1.13
Average common shares outstanding 966,132 966,132 966,132 966,132
Cash dividends declared per share $ 0.18 $ 0.15 $ 0.76 $ 0.30