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Unaudited Condensed Statements of Comprehensive Income (Loss) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]    
Net income (loss) $ 336,443 $ (1,105,791)
Unrealized gain (loss) on available-for-sale securities, net of deferred taxes 10,128 (4,136)
Total comprehensive income (loss) $ 346,571 $ (1,109,927)