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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Net income (loss) $ 460,908 $ 298,350 $ (1,222,344) $ (514,329)
Other comprehensive income (loss), net of tax:        
Unrealized (loss) gain on marketable securities, net of tax (8,837) 4,332 (16,868) (1,978)
Unrealized foreign currency gain, net of tax 4,355 4,355
Comprehensive income (loss) $ 456,426 $ 302,682 $ (1,234,857) $ (516,307)