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Significant Accounting Policies - Earnings (Loss) per Common Share (Details)
 12 Months Ended
Apr. 21, 2025
Jun. 30, 2025
USD ($)
$ / shares
shares
Jun. 30, 2024
USD ($)
$ / shares
shares
Significant Accounting Policies      
Exchange ratio for conversion of shares 1.3728 1.3728  
Net income (loss) | $   $ 42,445 $ (186,994)
Average number of shares outstanding   2,897,535 2,909,223
Less: Average unallocated ESOP shares   133,660 105,581
Average number of common shares outstanding used to calculate basic earnings per share [1]   2,763,875 2,803,642
Average number of common shares outstanding used to calculate dilutive earnings per share [1]   2,763,875 2,803,642
Earnings (loss) per common share:      
Basic | $ / shares [1]   $ 0.02 $ (0.07)
Diluted | $ / shares [1]   $ 0.02 $ (0.07)
[1] Share amounts related to periods prior to the April 21, 2025 closing of the conversion offering have been restated to give retroactive recognition to the 1.3728 exchange ratio applied in the conversion offering (See Note 1).