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Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Apr. 21, 2025
USD ($)
$ / shares
shares
Apr. 14, 2025
Jun. 30, 2025
USD ($)
facility
subsidiary
segment
shares
Jun. 30, 2024
USD ($)
shares
Apr. 20, 2025
USD ($)
Jun. 30, 2023
USD ($)
Property, Plant and Equipment [Line Items]            
Sale of stock, percentage of ownership after transaction   45.00%        
Shares of common stock issued | shares 1,693,411          
Shares issued to the ESOP | shares 135,472          
Share price | $ / shares $ 10          
Exchange ratio for conversion of shares 1.3728   1.3728      
Gross offering proceeds $ 16,900,000   $ 15,210,356      
Offering expenses $ 1,700,000   $ 1,700,000      
Shares released | shares 135,472   6,473 4,799    
Amount of ESOP loan $ 2,100,000       $ 777,212  
Annual installments maturity term 25 years          
Number of business facilities | facility     5      
Nonbank subsidiaries | subsidiary     2      
Accrued interest receivable on AFS securities     $ 64,377 $ 83,986    
Investment in restricted stock, at cost     1,329,413 1,329,413    
Loans held for sale     0 0    
Finance lease liability     0 0    
In process of foreclosure amount     66,645 0    
Foreclosed assets     996,373 1,375,140    
Unpaid principal balances of mortgage loans     77,322,000 81,058,000    
Unrecognized tax benefit     0 0    
Advertising costs     $ 42,183 61,234    
Number of reportable segments | segment     1      
Number of operating segments | segment     1      
Interest bearing     $ 152,774,734 150,418,396    
Non-interest bearing     22,466,092 22,562,358    
Interest bearing deposits held in other financial institutions     237,247 199,888    
Total liabilities     193,125,579 188,001,212    
Net Income (Loss)     42,445 (186,994)    
Total equity     45,709,221 31,294,784   $ 31,279,518
Retained Earnings            
Property, Plant and Equipment [Line Items]            
Net Income (Loss)     42,445 (186,994)    
Total equity     $ 25,566,126 25,523,681   $ 25,577,300
Marathon Mutual Holding Company            
Property, Plant and Equipment [Line Items]            
Sale of stock, percentage of ownership before transaction   55.00%        
Revision of Prior Period, Reclassification, Adjustment [Member]            
Property, Plant and Equipment [Line Items]            
Interest bearing       3,400,000    
Non-interest bearing       (3,400,000)    
Total deposits       0    
Total liabilities       0    
Net Income (Loss)       0    
Total equity       0    
Buildings and improvements | Minimum            
Property, Plant and Equipment [Line Items]            
Estimated useful lives     5 years      
Buildings and improvements | Maximum            
Property, Plant and Equipment [Line Items]            
Estimated useful lives     40 years      
Furniture and equipment | Minimum            
Property, Plant and Equipment [Line Items]            
Estimated useful lives     3 years      
Furniture and equipment | Maximum            
Property, Plant and Equipment [Line Items]            
Estimated useful lives     10 years      
Other assets            
Property, Plant and Equipment [Line Items]            
Servicing right asset     $ 730,533 $ 776,659