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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Revenue $ 3,993,204 $ 5,704,882 $ 13,748,448 $ 14,100,261
Cost of revenue 3,557,413 4,305,059 10,775,618 12,595,340
Gross profit 435,791 1,399,823 2,972,830 1,504,921
Operating expenses        
Research and development 90,227 112,724 300,162 453,724
Selling and shipping 142,306 175,760 439,346 680,183
General and administrative 1,595,911 1,359,910 4,650,067 4,728,021
Total operating expenses 1,828,444 1,648,394 5,389,575 5,861,928
Operating loss (1,392,653) (248,571) (2,416,745) (4,357,007)
Other income (expense):        
Interest income 30,348 26,774 60,728 115,643
Interest expense (104,041) (124,449) (336,107) (365,255)
Other Income 174,705 207,237 394,938 207,237
Total other income (expense), net 101,012 109,562 119,559 (42,375)
Loss before income tax (1,291,641) (139,009) (2,297,186) (4,399,382)
Income tax benefit (1,000) (1,529,595) (691,697)
Net loss $ (1,291,641) $ (138,009) $ (767,591) $ (3,707,685)
Basic loss per common share (in dollars per share) $ (0.19) $ (0.02) $ (0.12) $ (0.57)
Diluted loss per common share (in dollars per share) $ (0.19) $ (0.02) $ (0.12) $ (0.57)
Weighted average common shares Outstanding-basic (in shares) 6,640,228 6,556,767 6,633,694 6,550,279
Weighted average common shares Outstanding-diluted (in shares) 6,640,228 6,556,767 6,633,694 6,550,279