Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net Income	$ 56,005,800	$ 40,271,085	$ 32,494,507
Other Comprehensive Income:
Unrealized Holding Gains (Losses) Arising During the Period	(31,203,757)	(4,059,988)	22,782,469
Reclassification Adjustment for Net Gains Realized in Income	(111,387)	(2,311,714)	(4,398,599)
Total Comprehensive Income	24,690,656	33,899,383	50,878,377
Less: Preferred Dividends	17,190,456	14,861,686	9,020,470
Less: Redemption of Preferred Stock	0	2,467,165	2,942,149
Comprehensive Income Attributable to Common Shareholders	$ 7,500,200	$ 16,570,532	$ 38,915,758