Loans and Allowance for Loan Losses - Risk rating (Details) - USD ($)	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 227,074,298	$ 216,832,440	$ 234,266,091
1-4
Financing Receivable, Recorded Investment [Line Items]
Total Loans	221,982,059	211,512,322
5
Financing Receivable, Recorded Investment [Line Items]
Total Loans	4,452,209	4,526,977
6
Financing Receivable, Recorded Investment [Line Items]
Total Loans	640,030	793,141
Construction, Land, Development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	8,070,394	2,458,461	3,619,835
Construction, Land, Development | 1-4
Financing Receivable, Recorded Investment [Line Items]
Total Loans	8,070,394	2,458,461
Construction, Land, Development | 5
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Construction, Land, Development | 6
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Construction, Land, Development | 7
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Residential | 1-4 Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	74,012,356	72,011,570	92,578,159
Residential | 1-4 Family Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	21,211,782	22,368,557	20,831,506
Residential | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total Loans	96,821,185	91,876,323	82,503,675
Residential | 1-4 | 1-4 Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	73,519,200	71,319,957
Residential | 1-4 | 1-4 Family Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	21,211,782	22,368,557
Residential | 1-4 | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total Loans	96,821,185	91,876,323
Residential | 5 | 1-4 Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	55,609	104,137
Residential | 5 | 1-4 Family Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Residential | 5 | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Residential | 6 | 1-4 Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	437,547	587,476
Residential | 6 | 1-4 Family Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Residential | 6 | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Residential | 7 | 1-4 Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Residential | 7 | 1-4 Family Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Residential | 7 | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Commercial | Commercial Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,296,756	6,405,226	6,588,790
Commercial | Commercial Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	13,458,274	14,182,106	20,620,785
Commercial | 1-4 | Commercial Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	4,956,966	5,064,818
Commercial | 1-4 | Commercial Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	10,219,550	10,917,142
Commercial | 5 | Commercial Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,157,876	1,157,876
Commercial | 5 | Commercial Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,238,724	3,264,964
Commercial | 6 | Commercial Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	181,914	182,532
Commercial | 6 | Commercial Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Commercial | 7 | Commercial Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Commercial | 7 | Commercial Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Loans	7,203,551	7,530,197	$ 7,523,341
Consumer | 1-4
Financing Receivable, Recorded Investment [Line Items]
Total Loans	7,182,982	7,507,064
Consumer | 5
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Consumer | 6
Financing Receivable, Recorded Investment [Line Items]
Total Loans	20,569	23,133
Consumer | 7
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 0	$ 0