Loans and Allowance for Loan Losses - Bank loan portfolio aging analysis (Details) - USD ($)	Sep. 30, 2022	Jun. 30, 2022
Financing Receivable, Past Due [Line Items]
Total	$ 82,922,637	$ 82,267,595
Total Loans > 90 Days & Accruing	54,591	133,681
Total Past Due
Financing Receivable, Past Due [Line Items]
Total	175,035	306,875
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	76,674	89,856
Greater Than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	98,361	217,019
Current
Financing Receivable, Past Due [Line Items]
Total	82,747,602	81,960,720
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	4,972,791	5,136,407
Commercial real estate | Current
Financing Receivable, Past Due [Line Items]
Total	4,972,791	5,136,407
Residential real estate
Financing Receivable, Past Due [Line Items]
Total	66,123,917	65,638,154
Total Loans > 90 Days & Accruing	54,591	133,681
Residential real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	175,035	306,875
Residential real estate | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	76,674	89,856
Residential real estate | Greater Than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	98,361	217,019
Residential real estate | Current
Financing Receivable, Past Due [Line Items]
Total	65,948,882	65,331,279
Multifamily real estate
Financing Receivable, Past Due [Line Items]
Total	711,402	718,911
Multifamily real estate | Current
Financing Receivable, Past Due [Line Items]
Total	711,402	718,911
Agricultural real estate
Financing Receivable, Past Due [Line Items]
Total	4,015,564	3,450,672
Agricultural real estate | Current
Financing Receivable, Past Due [Line Items]
Total	4,015,564	3,450,672
Construction and land
Financing Receivable, Past Due [Line Items]
Total	5,517,796	6,006,613
Construction and land | Current
Financing Receivable, Past Due [Line Items]
Total	5,517,796	6,006,613
Home equity line of credit (HELOC)
Financing Receivable, Past Due [Line Items]
Total	494,128	264,421
Home equity line of credit (HELOC) | Current
Financing Receivable, Past Due [Line Items]
Total	494,128	264,421
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	301,945	339,094
Commercial and industrial | Current
Financing Receivable, Past Due [Line Items]
Total	301,945	339,094
Consumer
Financing Receivable, Past Due [Line Items]
Total	785,094	713,323
Consumer | Current
Financing Receivable, Past Due [Line Items]
Total	$ 785,094	$ 713,323