XML 87 R77.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Income Taxes - Additional Information (Detail) - USD ($) | Jun. 30, 2022 | Jun. 30, 2021
--- | --- | ---
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

X
- Definition Amount deferred income tax liabilities expected to reverse into taxable income. + References No definition available. + Details
Name: | iroq_AmountDeferredIncomeTaxLiabilitiesExpectedToReverseIntoTaxableIncome
Namespace Prefix: | iroq_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Retained earnings excluding deferred federal income tax liability. + References No definition available. + Details
Name: | iroq_RetainedEarningsExcludingDeferredFederalIncomeTaxLiability
Namespace Prefix: | iroq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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