Loans and Allowance for Loan Losses - Risk rating (Details) - USD ($)	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 234,266,091	$ 238,653,905	$ 252,414,565
Construction, Land, Development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,619,835	4,598,382	5,670,043
1-4 Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	92,578,159	100,506,311	114,503,607
1-4 Family Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	20,831,506	21,213,680	20,493,732
Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total Loans	82,503,675	76,444,156	74,074,709
Commercial Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,588,790	6,733,183	8,362,568
Commercial Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	20,620,785	20,237,534	19,604,096
Consumer and Installment Loan
Financing Receivable, Recorded Investment [Line Items]
Total Loans	7,523,341	8,920,659	$ 9,705,810
1-4
Financing Receivable, Recorded Investment [Line Items]
Total Loans	223,736,373	229,193,196
1-4 | Construction, Land, Development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,619,835	4,598,382
1-4 | 1-4 Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	91,371,716	99,344,653
1-4 | 1-4 Family Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	20,831,506	21,156,106
1-4 | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total Loans	82,503,675	76,444,156
1-4 | Commercial Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	5,257,598	6,543,934
1-4 | Commercial Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	12,761,112	12,313,923
1-4 | Consumer and Installment Loan
Financing Receivable, Recorded Investment [Line Items]
Total Loans	7,390,931	8,792,042
5
Financing Receivable, Recorded Investment [Line Items]
Total Loans	9,259,023	8,119,535
5 | Construction, Land, Development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
5 | 1-4 Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	241,474	195,924
5 | 1-4 Family Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
5 | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
5 | Commercial Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,157,876	0
5 | Commercial Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	7,859,673	7,923,611
5 | Consumer and Installment Loan
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
6
Financing Receivable, Recorded Investment [Line Items]
Total Loans	820,675	1,150,479
6 | Construction, Land, Development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
6 | 1-4 Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	591,117	851,208
6 | 1-4 Family Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	57,574
6 | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
6 | Commercial Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	173,316	189,249
6 | Commercial Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
6 | Consumer and Installment Loan
Financing Receivable, Recorded Investment [Line Items]
Total Loans	56,242	52,448
7
Financing Receivable, Recorded Investment [Line Items]
Total Loans	450,020	190,695
7 | Construction, Land, Development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
7 | 1-4 Family Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	373,852	114,526
7 | 1-4 Family Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
7 | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
7 | Commercial Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
7 | Commercial Non-Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
7 | Consumer and Installment Loan
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 76,168	$ 76,169