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Significant Accounting Policies - Narrative (Details)
 1 Months Ended 12 Months Ended
Apr. 30, 2021
$ / shares
shares
Jun. 30, 2024
USD ($)
facility
Jun. 30, 2023
USD ($)
Shares of common stock issued | shares 1,003,274    
Share price | $ / shares $ 10.00    
Sale of stock, percentage of ownership after transaction 45.00%    
Number of business facilities | facility   5  
Investment in restricted stock, at cost   $ 1,329,413 $ 770,273
Loans held for sale   0 0
In process of foreclosure amount   0 0
Foreclosed assets   1,397,460 2,334,560
Unpaid principal balances of mortgage loans   81,058,000 81,849,000
Unrecognized tax benefit   0 0
Advertising costs   61,234 87,179
Right-to-use assets   529,366 591,982
Lease liability   $ 524,973 585,182
Marathon Mutual Holding Company      
Sale of stock, percentage of ownership before transaction 55.00%    
Shares of common stock issued | shares 1,226,223    
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   $ 776,659 $ 818,151