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3. Income (Loss) Per Common Share (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Net income (loss) per share of common stock:        
Warrants 0 250,000 0 250,000
Convertible preferred stock 1,751,005 1,751,005 1,751,005 1,751,005
Total possible dilution 1,751,005 2,001,005 1,751,005 2,001,005