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3. Income (Loss) Per Common Share (Tables)
6 Months Ended
Jun. 30, 2018
Net income (loss) per share of common stock:  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
    June 30, 2018     June 30, 2017  
Warrants     250,000       250,000  
Convertible preferred stock     1,751,005       1,751,005  
Total possible dilution     2,001,005       2,001,005