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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Condensed Consolidated Statements of Income    
Net sales $ 9,596,395 $ 9,283,791
Cost of goods sold 7,167,778 7,189,926
Gross profit 2,428,617 2,093,865
Selling and administrative expenses 1,458,719 1,425,825
Operating profit 969,898 668,040
Other income 13,159 10,433
Income before provision for income taxes 983,057 678,473
Provision for income taxes 336,000 216,000
Net income $ 647,057 $ 462,473
Per share data, basic and diluted:    
Net income per share $ 0.67 $ 0.48
Average common shares outstanding 966,132 966,132
Cash dividends declared per share $ 0.43 $ 0.43