Loans and Allowance for Loan Losses - Changes In Allowance (Details) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning	$ 1,412,489	$ 1,353,427	$ 1,353,427
Charge-offs		(325)	(91,485)
Recoveries	400	382	547
Provision	50,000	0	150,000
Balance at Ending	1,462,889	1,353,484	1,412,489
Allowance
Ending balance individually evaluated for impairment	88,585	180,537	88,759
Ending balance collectively evaluated for impairment	1,374,304	1,172,947	1,323,730
Ending balance	1,462,889	1,353,484	1,412,489
Loans
Ending balance individually evaluated for impairment	640,030	1,270,695	793,141
Ending balance collectively evaluated for impairment	226,434,268	232,995,396	216,039,299
Total loans	227,074,298	234,266,091	216,832,440
Less allowance	1,462,889	1,353,484	1,412,489
Total	225,611,409	232,912,607	215,419,951
Construction, Land, Development
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning	11,063	13,795	13,795
Provision	25,254	(2,936)	(2,732)
Balance at Ending	36,317	10,859	11,063
Allowance
Ending balance collectively evaluated for impairment	36,317	10,859	11,063
Ending balance	36,317	10,859	11,063
Loans
Ending balance collectively evaluated for impairment	8,070,394	3,619,835	2,458,461
Total loans	8,070,394	3,619,835	2,458,461
Less allowance	36,317	10,859	11,063
Total	8,034,077	3,608,976	2,447,398
Residential | 1-4 Family Owner Occupied
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning	326,408	356,434	356,434
Charge-offs			(61,491)
Provision	13,508	(21,043)	31,465
Balance at Ending	339,916	335,391	326,408
Allowance
Ending balance individually evaluated for impairment		66,048
Ending balance collectively evaluated for impairment	339,916	269,343	326,408
Ending balance	339,916	335,391	326,408
Loans
Ending balance individually evaluated for impairment	437,547	964,969	587,476
Ending balance collectively evaluated for impairment	73,574,809	91,613,190	71,424,094
Total loans	74,012,356	92,578,159	72,011,570
Less allowance	339,916	335,391	326,408
Total	73,672,440	92,242,768	71,685,162
Residential | 1-4 Family Non-Owner Occupied
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning	115,645	77,220	77,220
Provision	(15,526)	(1,393)	38,425
Balance at Ending	100,119	75,827	115,645
Allowance
Ending balance collectively evaluated for impairment	100,119	75,827	115,645
Ending balance	100,119	75,827	115,645
Loans
Ending balance collectively evaluated for impairment	21,211,782	20,831,506	22,368,557
Total loans	21,211,782	20,831,506	22,368,557
Less allowance	100,119	75,827	115,645
Total	21,111,663	20,755,679	22,252,912
Residential | Multifamily
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning	459,382	286,665	286,665
Provision	24,724	63,976	172,717
Balance at Ending	484,106	350,641	459,382
Allowance
Ending balance collectively evaluated for impairment	484,106	350,641	459,382
Ending balance	484,106	350,641	459,382
Loans
Ending balance collectively evaluated for impairment	96,821,185	82,503,675	91,876,323
Total loans	96,821,185	82,503,675	91,876,323
Less allowance	484,106	350,641	459,382
Total	96,337,079	82,153,034	91,416,941
Commercial | Commercial Owner Occupied
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning	99,851	95,711	95,711
Provision	1,796	(20,527)	4,140
Balance at Ending	101,647	75,184	99,851
Allowance
Ending balance individually evaluated for impairment	68,016	54,334	65,626
Ending balance collectively evaluated for impairment	33,631	20,850	34,225
Ending balance	101,647	75,184	99,851
Loans
Ending balance individually evaluated for impairment	181,914	173,316	182,532
Ending balance collectively evaluated for impairment	6,114,842	6,415,474	6,222,694
Total loans	6,296,756	6,588,790	6,405,226
Less allowance	101,647	75,184	99,851
Total	6,195,109	6,513,606	6,305,375
Commercial | Commercial Non-Owner Occupied
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning	230,459	312,670	312,670
Provision	(11,762)	16,232	(82,211)
Balance at Ending	218,697	328,902	230,459
Allowance
Ending balance collectively evaluated for impairment	218,697	328,902	230,459
Ending balance	218,697	328,902	230,459
Loans
Ending balance collectively evaluated for impairment	13,458,274	20,620,785	14,182,106
Total loans	13,458,274	20,620,785	14,182,106
Less allowance	218,697	328,902	230,459
Total	13,239,577	20,291,883	13,951,647
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning	66,523	97,312	97,312
Charge-offs		(325)	(29,994)
Recoveries	400	382	547
Provision	(5,052)	(7,428)	(1,342)
Balance at Ending	61,871	89,941	66,523
Allowance
Ending balance individually evaluated for impairment	20,569	60,155	23,133
Ending balance collectively evaluated for impairment	41,302	29,786	43,390
Ending balance	61,871	89,941	66,523
Loans
Ending balance individually evaluated for impairment	20,569	132,410	23,133
Ending balance collectively evaluated for impairment	7,182,982	7,390,931	7,507,064
Total loans	7,203,551	7,523,341	7,530,197
Less allowance	61,871	89,941	66,523
Total	7,141,680	7,433,400	7,463,674
Not Specifically Allocated
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning	103,158	113,620	113,620
Provision	17,058	(26,881)	(10,462)
Balance at Ending	120,216	86,739	103,158
Allowance
Ending balance collectively evaluated for impairment	120,216	86,739	103,158
Ending balance	120,216	86,739	103,158
Loans
Less allowance	120,216	86,739	103,158
Total	$ (120,216)	$ (86,739)	$ (103,158)