Consolidated Statements of Changes in Stockholders' Equity - USD ($)	Common Stock	Additional Paid-in Capital	Retained Earnings Revision of Prior Period, Adjustment [Member]	Retained Earnings	Unearned ESOP Shares.	Accumulated Other Comprehensive Loss.	Revision of Prior Period, Adjustment [Member]	Total
Balance, beginning of period at Jun. 30, 2023	$ 21,141	$ 7,252,506		$ 25,577,300	$ (786,572)	$ (784,857)		$ 31,279,518
Balance, beginning of period (in shares) at Jun. 30, 2023	2,961,812
Net income (loss)				(186,994)				(186,994)
ESOP shares committed to be released		(1,023)			34,959			33,936
Stock based compensation		159,100						159,100
Other comprehensive income						32,069		$ 32,069
Purchase of employee restricted shares to fund statutory tax withholdings (in shares)	(2,858)							2,858
Purchase of employee restricted shares to fund statutory tax withholdings	$ (21)	(22,573)						$ (22,594)
Purchase and retirement of common stock shares (in shares)	(20,592)							(20,592)
Purchase and retirement of common stock shares	$ (150)	(133,476)						$ (133,626)
Balance, end of period (in shares) at Jun. 30, 2024	2,938,362							2,938,362
Balance, end of period (Accounting Standards Update 2016-13) at Jun. 30, 2024			$ 133,375				$ 133,375
Balance, end of period at Jun. 30, 2024	$ 20,970	7,254,534		25,523,681	(751,613)	(752,788)		$ 31,294,784
Conversion of Marathon Bancorp, Inc. (net of costs of $1.7 million) (in shares)	9,950
Conversion of Marathon Bancorp, Inc. (net of costs of $1.7 million)	$ 8,061	15,202,295						15,210,356
Purchase of 1,354,720 shares by the ESOP					(1,354,720)			(1,354,720)
Contribution of Marathon Bancorp, Inc. Mutual Bancshares		100,000						100,000
Net income (loss)				42,445				42,445
ESOP shares committed to be released		2,411			59,256			$ 61,667
Restricted stock forfeited (in shares)	(1,270)							(1,270)
Exercise of stock options (in shares)	1,749							1,749
Exercise of stock options	$ 13	13,301						$ 13,314
Stock based compensation		156,682						156,682
Other comprehensive income						266,858		$ 266,858
Purchase of employee restricted shares to fund statutory tax withholdings (in shares)	(3,229)							3,229
Purchase of employee restricted shares to fund statutory tax withholdings	$ (32)	(37,633)						$ (37,665)
Purchase and retirement of common stock shares (in shares)	(6,864)							(6,864)
Purchase and retirement of common stock shares	$ (50)	(44,450)						$ (44,500)
Balance, end of period (in shares) at Jun. 30, 2025	2,938,698							2,938,698
Balance, end of period at Jun. 30, 2025	$ 28,962	$ 22,647,140		$ 25,566,126	$ (2,047,077)	$ (485,930)		$ 45,709,221