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Statement of Comprehensive Income (Loss) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]      
Net income (loss) $ 1,141,255 $ 3,733,707 $ (270,342)
Unrealized loss on available-for-sale securities (16,907)    
Total comprehensive income (loss) $ 1,124,348 $ 3,733,707 $ (270,342)