Other Investments (Schedule of Other Investments) (Details) - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Other Assets:
Investment in unconsolidated affiliates	$ 57,542,805	$ 47,375,459
Current Liabilities:
Capital contributions payable	2,512,437	5,024,824
Income Statement Location of Other Investments:
Equity in earnings of unconsolidated affiliate	4,814,874	3,020,348
Undistributed earnings, net of income taxes, of MVP in retained earnings	6,842,702	3,267,176
Change in investment in unconsolidated affiliate [Abstract]
Cash investment	7,864,859	20,965,907
Change in accrued capital calls	(2,512,387)	(5,117,942)
Equity in earnings of unconsolidated affiliate	4,814,874	3,020,348
Change in investment in unconsolidated affiliates	10,167,346	18,868,313
MVP Investment
Other Assets:
MVP	57,183,063	47,055,426
Current Liabilities:
Capital contributions payable	2,501,883	4,958,260
MVP Southgate Investment
Other Assets:
Southgate	359,742	320,033
Current Liabilities:
Capital contributions payable	$ 10,554	$ 66,564