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Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenue    
Sales $ 14,055,872 $ 15,123,845
Cost of goods sold 11,553,866 12,629,604
Gross margin 2,502,006 2,494,241
Expenses:    
Selling, general and administrative expenses 2,008,667 2,118,833
Depreciation and amortization 89,752 85,242
Total operating expenses 2,098,419 2,204,075
Operating income 403,587 290,166
Other (income) expense:    
Other (income) expense, net (23,959) 4,931
Interest expense 46,882 49,840
Total other (income) expense 22,923 54,771
Income before income taxes 380,664 235,395
Income tax expense 34,456 15,859
Net income $ 346,208 $ 219,536
Basic net income per common share: $ 0.01 $ 0.01
Diluted net income per share: $ 0.01 $ 0.01
Weighted-average number of common shares - Basic 26,924,381 26,905,631
Weighted-average number of common shares - Diluted 27,233,980 27,416,909