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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Net income $ 301,575 $ 1,178,850 $ 921,902 $ 2,224,790
Other comprehensive income        
Unrealized gain (loss) on marketable securities (7,692) 10,232 (11,178) 9,620
Unrealized foreign currency gain (loss) (61,660) (79,323) 27,140 (133,046)
Comprehensive income $ 232,223 $ 1,109,759 $ 937,864 $ 2,101,364