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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenue $ 3,365,860 $ 6,036,360
Cost of revenue 3,047,280 4,100,836
Gross profit 318,580 1,935,524
Operating expenses    
Research and development 100,432 113,828
Selling and shipping 135,755 165,777
General and administrative 1,701,180 1,547,758
Total operating expenses 1,937,367 1,827,363
Operating (loss) income (1,618,787) 108,161
Other income (expense):    
Interest income 1,223 24,902
Interest expense (107,221) (116,038)
Other Income 219,235 110,809
Total other income, net 113,237 19,673
(Loss) income before income tax (1,505,550) 127,834
Income tax (benefit) (1,530,644)
Net (loss) income $ (1,505,550) $ 1,658,478
Basic (loss) income per common share (in dollars per share) $ (0.23) $ 0.25
Diluted (loss) income per common share (in dollars per share) $ (0.23) $ 0.25
Weighted average common shares Outstanding-basic (in shares) 6,680,130 6,626,036
Weighted average common shares Outstanding-diluted (in shares) 6,680,130 6,626,036