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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Condensed Consolidated Statements of Income (Unaudited)    
Net sales $ 9,197,696 $ 9,304,949
Cost of goods sold 7,341,474 7,270,512
Gross profit 1,856,222 2,034,437
Selling and administrative expenses 1,295,664 1,362,201
Operating profit 560,558 672,236
Other income 9,755 17,892
Income before income taxes 570,313 690,128
Provision for income taxes 123,000 150,000
Net Income $ 447,313 $ 540,128
Per share data    
Basic net income per share $ 0.46 $ 0.56
Diluted net income per share $ 0.46 $ 0.56
Basic 966,132 966,132
Diluted 966,132 966,132
Cash dividends declared per share $ 0.22 $ 0.22