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Statement of Comprehensive Income (Loss) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]      
Net income (loss) $ (2,584,320) $ 1,141,255 $ 3,733,707
Unrealized gain (loss) on available-for-sale securities, net of deferred taxes 5,766 (16,907)  
Total comprehensive income (loss) $ (2,578,554) $ 1,124,348 $ 3,733,707