Other Comprehensive Income (Details) - USD ($)	3 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, at beginning	$ 21,196,469	$ 20,782,335	$ 20,271,957	$ 20,139,787
Balance, at ending	21,620,687	21,196,469	20,413,486	20,271,957
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, at beginning	115,506	66,725	(170,797)	(157,954)
Other comprehensive gain before reclassifications (net of tax)	(16,008)	9,685	(15,791)	(17,284)
Amortization of amounts transferred from debt securities available for sale to held to maturity	49,498	39,096	5,173	4,441
Balance, at ending	148,996	115,506	(181,415)	(170,797)
Unrealized Gains and Losses on Available for Sale Debt Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, at beginning	272,373	262,688	49,078	66,362
Other comprehensive gain before reclassifications (net of tax)	(16,008)	9,685	(15,791)	(17,284)
Balance, at ending	256,365	272,373	33,287	49,078
Unrealized Losses on Held to Maturity Debt Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, at beginning	(156,867)	(195,963)	(219,875)	(224,316)
Amortization of amounts transferred from debt securities available for sale to held to maturity	49,498	39,096	5,173	4,441
Balance, at ending	$ (107,369)	$ (156,867)	$ (214,702)	$ (219,875)