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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income Statement [Abstract]    
Revenue $ 16,858,386 $ 21,988,384
Cost of sales 16,160,567 19,504,968
Gross profit 697,819 2,483,416
Selling, general and administrative expenses 3,093,090 2,905,686
Loss from operations (2,395,271) (422,270)
Interest expense 416,670 510,769
Loss before provision for (benefit from) income taxes (2,811,941) (933,039)
Provision for (benefit from) income taxes 578 1,677
Net loss $ (2,812,519) $ (934,716)
Loss per common share - basic (in dollars per share) $ (0.24) $ (0.08)
Loss per common share - diluted (in dollars per share) $ (0.24) $ (0.08)
Shares used in computing loss per common share:    
Basic (in shares) 11,837,014 11,736,305
Diluted (in shares) 11,837,014 11,736,305