Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS)

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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]        
Net income (loss) $ 89,368 $ (129,346) $ 543,969 $ (125,524)
Other comprehensive gain (loss)        
Unrealized gain (loss) on marketable equity securities   70,812   (21,777)
Comprehensive gain (loss) $ 89,368 $ (58,534) $ 543,969 $ (147,301)