Taxes - Schedule of Cash Dividends Paid and Dividends Paid Deduction (Details) - USD ($)	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Cash dividends paid	$ 42,034,183	$ 35,522,127	$ 29,531,430
Less: Portion designated capital (gains) losses distribution	(3,774,099)	(5,000,683)	(973,761)
Less: Return of capital	(9,470,625)	(2,939,882)	(9,856,777)
Estimated dividends paid deduction	$ 28,789,459	$ 27,581,562	$ 18,700,892