Significant Accounting Policies - Narrative (Details)	1 Months Ended	12 Months Ended
	Apr. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) facility	Jun. 30, 2022 USD ($)	Jul. 01, 2022 USD ($) loan
Shares of common stock issued | shares	1,003,274
Share price | $ / shares	$ 10.00
Sale of stock, percentage of ownership after transaction	45.00%
Proceeds from offering	$ 10,000,000.0
Offering expenses	1,400,000
Net cash proceeds from common stock offering	$ 8,500,000
Number of business facilities | facility		4
Investment in restricted stock, at cost		$ 770,273	$ 323,000
Loans held for sale		0	78,000
In process of foreclosure amount		0	0
Foreclosed assets		2,312,240	0
Unpaid principal balances of mortgage loans		81,849,000	85,493,000
Unrecognized tax benefit		0	0
Advertising costs		87,179	77,626
Right-to-use assets		591,982
Lease liability		$ 585,182
Number of operating lease obligations | loan				5
Marathon Mutual Holding Company
Sale of stock, percentage of ownership before transaction	55.00%
Shares of common stock issued | shares	1,226,223
Accounting Standards Update 2016-02 | Cumulative Effect, Period of Adoption, Adjustment
Right-to-use assets				$ 698,837
Lease liability				$ 698,837
Buildings And Improvements | Minimum
Estimated useful lives		5 years
Buildings And Improvements | Maximum
Estimated useful lives		40 years
Furniture And Equipment | Minimum
Estimated useful lives		3 years
Furniture And Equipment | Maximum
Estimated useful lives		10 years
Other Assets.
Servicing right asset		$ 818,151	$ 790,482