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3. Income (Loss) Per Common Share (Tables)
9 Months Ended
Sep. 30, 2020
Net income (loss) per share of common stock:  
Antidilutive securities excluded from computation of earnings per share
    September 30, 2020     September 30, 2019  
Warrants     6,194,899       702,041  
Convertible preferred stock     1,751,005       1,751,005  
Total possible dilution     7,945,904       2,453,046