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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Condensed Consolidated Statements of Income    
Net sales $ 9,483,327 $ 9,596,395
Cost of goods sold 7,226,816 7,167,778
Gross profit 2,256,511 2,428,617
Selling and administrative expenses 1,506,272 1,458,719
Operating profit 750,239 969,898
Other income 20,683 13,159
Income before provision for income taxes 770,922 983,057
Provision for income taxes 260,000 336,000
Net income $ 510,922 $ 647,057
Per share data, basic and diluted:    
Net income per share $ 0.53 $ 0.67
Average common shares outstanding 966,132 966,132
Cash dividends declared per share $ 0.55 $ 0.43