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Income Taxes - summary of income taxes compared to the federal income tax statutory rate (Details) - USD ($)	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Effective Income Tax Rate Reconciliation, Amount [Abstract]
At Federal statutory rate at 21%	$ 2,287	$ (51,681)
Tax exempt interest	(3,112)	(5,008)
Wisconsin change in tax law		112,058
Earnings and gain on bank owned life insurance	(56,676)	(52,245)
State tax, net of federal benefit	(305,847)	(321,355)
Equity compensation	6,115	23,534
Increase/decrease in valuation allowance	343,653	321,355
Other	(17,975)	(85,766)
Income tax expense (benefit)	$ (31,555)	$ (59,108)
Federal statutory rate	21.00%	21.00%

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to earnings on bank owned life insurance.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to Wisconsin change in tax law.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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