Loans and Allowance for Loan Losses - Credit risk profile of Bank's loan portfolio (Details) - USD ($)	Sep. 30, 2022	Jun. 30, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 82,922,637	$ 82,267,595
Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	66,618,045	65,902,575
Real estate loans | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total	66,394,448	65,676,993
Real estate loans | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total	223,597	225,582
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	66,123,917	65,638,154
Residential real estate | Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	66,123,917	65,638,154
Residential real estate | Real estate loans | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total	65,900,320	65,412,572
Residential real estate | Real estate loans | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total	223,597	225,582
Home equity line of credit (HELOC)
Financing Receivable, Credit Quality Indicator [Line Items]
Total	494,128	264,421
Home equity line of credit (HELOC) | Real estate loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	494,128	264,421
Home equity line of credit (HELOC) | Real estate loans | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 494,128	$ 264,421