Loans and Allowance for Loan Losses - Changes In Allowance (Details) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning	$ 1,353,427	$ 1,293,965	$ 1,293,965
Charge-offs	(325)	(7,826)	(102,729)
Recoveries	382	535	27,191
Provision			135,000
Balance at Ending	1,353,484	1,286,674	1,353,427
Allowance
Ending balance individually evaluated for impairment				$ 180,537	$ 205,923	$ 136,116
Ending balance collectively evaluated for impairment				1,172,947	1,147,504	1,150,558
Ending balance				1,353,484	1,353,427	1,286,674
Loans
Ending balance individually evaluated for impairment				1,270,695	1,341,174	1,196,462
Ending balance collectively evaluated for impairment				232,995,396	237,312,731	251,218,103
Total loans				234,266,091	238,653,905	252,414,565
Less allowance	1,353,484	1,286,674	1,353,427	1,353,484	1,353,427	1,286,674
Total				232,912,607	237,300,478	251,127,891
Construction, Land, Development
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning	13,795	4,319	4,319
Provision	(2,936)	1,351	9,476
Balance at Ending	10,859	5,670	13,795
Allowance
Ending balance collectively evaluated for impairment				10,859	13,795	5,670
Ending balance				10,859	13,795	5,670
Loans
Ending balance collectively evaluated for impairment				3,619,835	4,598,382	5,670,043
Total loans				3,619,835	4,598,382	5,670,043
Less allowance	10,859	5,670	13,795	10,859	13,795	5,670
Total				3,608,976	4,584,587	5,664,373
1-4 Family Owner Occupied
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning	356,434	67,593	67,593
Charge-offs			(57,572)
Recoveries		335	5,155
Provision	(21,043)	(11,124)	341,258
Balance at Ending	335,391	56,804	356,434
Allowance
Ending balance individually evaluated for impairment				66,048	64,780
Ending balance collectively evaluated for impairment				269,343	291,654	56,804
Ending balance				335,391	356,434	56,804
Loans
Ending balance individually evaluated for impairment				964,969	965,734	892,031
Ending balance collectively evaluated for impairment				91,613,190	99,540,577	113,611,576
Total loans				92,578,159	100,506,311	114,503,607
Less allowance	335,391	56,804	356,434	335,391	356,434	56,804
Total				92,242,768	100,149,877	114,446,803
1-4 Family Non-Owner Occupied
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning	77,220	26,630	26,630
Provision	(1,393)	(603)	50,590
Balance at Ending	75,827	26,027	77,220
Allowance
Ending balance collectively evaluated for impairment				75,827	77,220	26,027
Ending balance				75,827	77,220	26,027
Loans
Ending balance individually evaluated for impairment					57,574
Ending balance collectively evaluated for impairment				20,831,506	21,156,106	20,493,732
Total loans				20,831,506	21,213,680	20,493,732
Less allowance	75,827	26,027	77,220	75,827	77,220	26,027
Total				20,755,679	21,136,460	20,467,705
Multifamily
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning	286,665	109,870	109,870
Provision	63,976	1,242	176,795
Balance at Ending	350,641	111,112	286,665
Allowance
Ending balance collectively evaluated for impairment				350,641	286,665	111,112
Ending balance				350,641	286,665	111,112
Loans
Ending balance collectively evaluated for impairment				82,503,675	76,444,156	74,074,709
Total loans				82,503,675	76,444,156	74,074,709
Less allowance	350,641	111,112	286,665	350,641	286,665	111,112
Total				82,153,034	76,157,491	73,963,597
Commercial Owner Occupied
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning	95,711	61,193	61,193
Provision	(20,527)	29,884	34,518
Balance at Ending	75,184	91,077	95,711
Allowance
Ending balance individually evaluated for impairment				54,334	79,351	74,737
Ending balance collectively evaluated for impairment				20,850	16,360	16,340
Ending balance				75,184	95,711	91,077
Loans
Ending balance individually evaluated for impairment				173,316	189,249	192,285
Ending balance collectively evaluated for impairment				6,415,474	6,543,934	8,170,283
Total loans				6,588,790	6,733,183	8,362,568
Less allowance	75,184	91,077	95,711	75,184	95,711	91,077
Total				6,513,606	6,637,472	8,271,491
Commercial Non-Owner Occupied
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning	312,670	738,366	738,366
Provision	16,232	34,820	(425,696)
Balance at Ending	328,902	773,186	312,670
Allowance
Ending balance collectively evaluated for impairment				328,902	312,670	773,186
Ending balance				328,902	312,670	773,186
Loans
Ending balance collectively evaluated for impairment				20,620,785	20,237,534	19,604,096
Total loans				20,620,785	20,237,534	19,604,096
Less allowance	328,902	773,186	312,670	328,902	312,670	773,186
Total				20,291,883	19,924,864	18,830,910
Consumer and Installment Loan
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning	97,312	70,058	70,058
Charge-offs	(325)	(7,826)	(45,157)
Recoveries	382	200	22,036
Provision	(7,428)	10,076	50,375
Balance at Ending	89,941	72,508	97,312
Allowance
Ending balance individually evaluated for impairment				60,155	61,792	61,379
Ending balance collectively evaluated for impairment				29,786	35,520	11,129
Ending balance				89,941	97,312	72,508
Loans
Ending balance individually evaluated for impairment				132,410	128,617	112,146
Ending balance collectively evaluated for impairment				7,390,931	8,792,042	9,593,664
Total loans				7,523,341	8,920,659	9,705,810
Less allowance	89,941	72,508	97,312	89,941	97,312	72,508
Total				7,433,400	8,823,347	9,633,302
Not Specifically Allocated
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning	113,620	215,936	215,936
Provision	(26,881)	(65,646)	(102,316)
Balance at Ending	86,739	150,290	113,620
Allowance
Ending balance collectively evaluated for impairment				86,739	113,620	150,290
Ending balance				86,739	113,620	150,290
Loans
Less allowance	$ 86,739	$ 150,290	$ 113,620	86,739	113,620	150,290
Total				$ (86,739)	$ (113,620)	$ (150,290)