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Unaudited Condensed Statement of Comprehensive Income - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 234,353 $ 1,183,044 $ 549,323 $ 2,633,405
Unrealized loss on available-for-sale securities (1,696)   (1,696)  
Total comprehensive income $ 232,657 $ 1,183,044 $ 547,627 $ 2,633,405