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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Net income (loss) $ 1,178,850 $ 460,908 $ 2,224,790 $ (1,222,344)
Other comprehensive income (loss), net of tax        
Unrealized gain (loss) on marketable securities 10,232 (8,837) 9,620 (16,868)
Unrealized foreign currency gain (loss) (79,323) 4,355 (133,046) 4,355
Comprehensive income (loss) $ 1,109,759 $ 456,426 $ 2,101,364 $ (1,234,857)