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Income Taxes - Additional Information (Detail) - USD ($) | Jun. 30, 2025 | Jun. 30, 2024
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Income Tax Disclosure [Abstract] |  |
Retained earnings excluding deferred federal income tax liability | $ 2,217,000 | $ 2,217,000
Amount deferred income tax liabilities expected to reverse into taxable income | $ 466,000 | $ 466,000

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- Definition Amount deferred income tax liabilities expected to reverse into taxable income. + References No definition available. + Details
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- Definition Retained earnings excluding deferred federal income tax liability. + References No definition available. + Details
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Namespace Prefix: | iroq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration