Loans - Loans by class based on payment activity (Details) - USD ($)	Jun. 30, 2022	Jun. 30, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 187,900,474	$ 146,873,595
Residential [Member] | One-to-four-family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	51,890,948	48,404,820
Residential [Member] | One-to-four-family residential | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	51,827,163	48,226,426
Residential [Member] | One-to-four-family residential | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	63,785	178,394
Residential [Member] | Multi-family real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	33,944,903	17,268,048
Residential [Member] | Multi-family real estate | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	33,944,903	17,268,048
Consumer Loans [Member] | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,100,259	1,788,997
Consumer Loans [Member] | Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,100,259	1,788,997
Residential Real Estate And Consumer Portfolio
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	87,936,110	67,461,865
Residential Real Estate And Consumer Portfolio | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	87,872,325	67,283,471
Residential Real Estate And Consumer Portfolio | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 63,785	$ 178,394