Quarterly report pursuant to Section 13 or 15(d)

Unaudited Condensed Statements of Comprehensive Income (Loss)

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Unaudited Condensed Statements 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) $ 437,259 $ 234,353 $ (3,858,879) $ 549,323
Unrealized gain (loss) on available-for-sale securities, net of deferred taxes 3,486 (1,696) 10,473 (1,696)
Total comprehensive income (loss) $ 440,745 $ 232,657 $ (3,848,406) $ 547,627