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Disclosure - Note 1 - Summary of Significant Accounting Policies (Details Textual) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-1-summary-of-significant-accounting-policies-details-textual Note 1 - Summary of Significant Accounting Policies (Details Textual) Details 50 false false R51.htm 995588 - Disclosure - Note 2 - Securities (Details Textual) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-2-securities-details-textual Note 2 - Securities (Details Textual) Details http://www.consumersbancorp.com/20260630/role/statement-note-2-securities-tables 51 false false R52.htm 995589 - Disclosure - Note 2 - Securities - Amortized Cost and Fair Value of Securities Available-for-sale and Securities Held-to-maturity (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-2-securities-amortized-cost-and-fair-value-of-securities-availableforsale-and-securities-heldtomaturity-details Note 2 - Securities - Amortized Cost and Fair Value of Securities Available-for-sale and Securities Held-to-maturity (Details) Details 52 false false R53.htm 995590 - Disclosure - Note 2 - Securities - Proceeds From Sales and Calls of Available-for-sale Securities (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-2-securities-proceeds-from-sales-and-calls-of-availableforsale-securities-details Note 2 - Securities - Proceeds From Sales and Calls of Available-for-sale Securities (Details) Details 53 false false R54.htm 995591 - Disclosure - Note 2 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-2-securities-amortized-cost-and-fair-values-of-debt-securities-by-contractual-maturity-details Note 2 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) Details 54 false false R55.htm 995592 - Disclosure - Note 2 - Securities - Securities With Unrealized and Unrecognized Losses (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-2-securities-securities-with-unrealized-and-unrecognized-losses-details Note 2 - 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Loans and Allowance for Credit Losses - Allowance for Loan Losses by Portfolio Segment (Details) Details 58 false false R59.htm 995596 - Disclosure - Note 3 - Loans and Allowance for Credit Losses - Non-accrual Loans (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-3-loans-and-allowance-for-credit-losses-nonaccrual-loans-details Note 3 - Loans and Allowance for Credit Losses - Non-accrual Loans (Details) Details 59 false false R60.htm 995597 - Disclosure - Note 3 - Loans and Allowance for Credit Losses - Loans Past Due (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-3-loans-and-allowance-for-credit-losses-loans-past-due-details Note 3 - Loans and Allowance for Credit Losses - Loans Past Due (Details) Details 60 false false R61.htm 995598 - Disclosure - Note 3 - Loans and Allowance for Credit Losses - Recorded Investment by Risk Category (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-3-loans-and-allowance-for-credit-losses-recorded-investment-by-risk-category-details Note 3 - Loans and Allowance for Credit Losses - Recorded Investment by Risk Category (Details) Details 61 false false R62.htm 995599 - Disclosure - Note 3 - Loans and Allowance for Credit Losses - Collateral Dependent Loans (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-3-loans-and-allowance-for-credit-losses-collateral-dependent-loans-details Note 3 - Loans and Allowance for Credit Losses - Collateral Dependent Loans (Details) Details 62 false false R63.htm 995600 - Disclosure - Note 4 - Premises and Equipment (Details Textual) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-4-premises-and-equipment-details-textual Note 4 - Premises and Equipment (Details Textual) Details http://www.consumersbancorp.com/20260630/role/statement-note-4-premises-and-equipment-tables 63 false false R64.htm 995601 - Disclosure - Note 4 - Premises and Equipment - Major Classifications of Premises and Equipment (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-4-premises-and-equipment-major-classifications-of-premises-and-equipment-details Note 4 - Premises and Equipment - Major Classifications of Premises and Equipment (Details) Details 64 false false R65.htm 995602 - Disclosure - Note 4 - Premises and Equipment - Maturities of Lease Liabilities (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-4-premises-and-equipment-maturities-of-lease-liabilities-details Note 4 - Premises and Equipment - Maturities of Lease Liabilities (Details) Details 65 false false R66.htm 995603 - Disclosure - Note 5 - Goodwill and Acquired Intangible Assets (Details Textual) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-5-goodwill-and-acquired-intangible-assets-details-textual Note 5 - Goodwill and Acquired Intangible Assets (Details Textual) Details http://www.consumersbancorp.com/20260630/role/statement-note-5-goodwill-and-acquired-intangible-assets-tables 66 false false R67.htm 995604 - Disclosure - Note 5 - Goodwill and Acquired Intangible Assets - Goodwill and Intangible Assets (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-5-goodwill-and-acquired-intangible-assets-goodwill-and-intangible-assets-details Note 5 - Goodwill and Acquired Intangible Assets - Goodwill and Intangible Assets (Details) Details 67 false false R68.htm 995605 - Disclosure - Note 6 - Deposits - Interest-bearing Deposits (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-6-deposits-interestbearing-deposits-details Note 6 - Deposits - Interest-bearing Deposits (Details) Details 68 false false R69.htm 995606 - Disclosure - Note 6 - Deposits - Maturities of Time Deposits (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-6-deposits-maturities-of-time-deposits-details Note 6 - Deposits - Maturities of Time Deposits (Details) Details 69 false false R70.htm 995607 - Disclosure - Note 7 - Short-term Borrowings (Details Textual) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-7-shortterm-borrowings-details-textual Note 7 - Short-term Borrowings (Details Textual) Details http://www.consumersbancorp.com/20260630/role/statement-note-7-shortterm-borrowings-tables 70 false false R71.htm 995608 - Disclosure - Note 7 - Short-term Borrowings - Summary of Short-term Borrowings (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-7-shortterm-borrowings-summary-of-shortterm-borrowings-details Note 7 - Short-term Borrowings - Summary of Short-term Borrowings (Details) Details 71 false false R72.htm 995609 - Disclosure - Note 7 - Short-term Borrowings - Schedule of Repurchase Agreements (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-7-shortterm-borrowings-schedule-of-repurchase-agreements-details Note 7 - Short-term Borrowings - Schedule of Repurchase Agreements (Details) Details 72 false false R73.htm 995610 - Disclosure - Note 8 - Federal Home Loan Bank Advances (Details Textual) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-8-federal-home-loan-bank-advances-details-textual Note 8 - Federal Home Loan Bank Advances (Details Textual) Details http://www.consumersbancorp.com/20260630/role/statement-note-8-federal-home-loan-bank-advances-tables 73 false false R74.htm 995611 - Disclosure - Note 8 - Federal Home Loan Bank Advances - Summary of Federal Home Loan Bank (FHLB) Advances (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-8-federal-home-loan-bank-advances-summary-of-federal-home-loan-bank-fhlb-advances-details Note 8 - Federal Home Loan Bank Advances - Summary of Federal Home Loan Bank (FHLB) Advances (Details) Details 74 false false R75.htm 995612 - Disclosure - Note 8 - Federal Home Loan Bank Advances - Summary of the Scheduled Principal Payments (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-8-federal-home-loan-bank-advances-summary-of-the-scheduled-principal-payments-details Note 8 - Federal Home Loan Bank Advances - Summary of the Scheduled Principal Payments (Details) Details 75 false false R76.htm 995613 - Disclosure - Note 9 - Employee Benefit Plans (Details Textual) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-9-employee-benefit-plans-details-textual Note 9 - Employee Benefit Plans (Details Textual) Details http://www.consumersbancorp.com/20260630/role/statement-note-9-employee-benefit-plans-tables 76 false false R77.htm 995614 - Disclosure - Note 9 - Employee Benefit Plans - Summary of the Restricted Stock Awards (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-9-employee-benefit-plans-summary-of-the-restricted-stock-awards-details Note 9 - Employee Benefit Plans - Summary of the Restricted Stock Awards (Details) Details 77 false false R78.htm 995615 - Disclosure - Note 10 - Income Taxes (Details Textual) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-10-income-taxes-details-textual Note 10 - Income Taxes (Details Textual) Details http://www.consumersbancorp.com/20260630/role/statement-note-10-income-taxes-tables 78 false false R79.htm 995616 - Disclosure - Note 10 - Income Taxes - Provision for Income Taxes (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-10-income-taxes-provision-for-income-taxes-details Note 10 - Income Taxes - Provision for Income Taxes (Details) Details 79 false false R80.htm 995617 - Disclosure - Note 10 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-10-income-taxes-schedule-of-effective-income-tax-rate-reconciliation-details Note 10 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) Details 80 false false R81.htm 995618 - Disclosure - Note 10 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) (Parentheticals) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-10-income-taxes-schedule-of-effective-income-tax-rate-reconciliation-details-parentheticals Note 10 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) (Parentheticals) Details 81 false false R82.htm 995619 - Disclosure - Note 10 - Income Taxes - Net Deferred Income Tax Asset (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-10-income-taxes-net-deferred-income-tax-asset-details Note 10 - Income Taxes - Net Deferred Income Tax Asset (Details) Details 82 false false R83.htm 995620 - Disclosure - Note 11 - Related Party Transactions (Details Textual) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-11-related-party-transactions-details-textual Note 11 - Related Party Transactions (Details Textual) Details http://www.consumersbancorp.com/20260630/role/statement-note-11-related-party-transactions-tables 83 false false R84.htm 995621 - Disclosure - Note 11 - Related Party Transactions - Loans to Related Parties (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-11-related-party-transactions-loans-to-related-parties-details Note 11 - Related Party Transactions - Loans to Related Parties (Details) Details 84 false false R85.htm 995622 - Disclosure - Note 12 - Regulatory Matters (Details Textual) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-12-regulatory-matters-details-textual Note 12 - Regulatory Matters (Details Textual) Details http://www.consumersbancorp.com/20260630/role/statement-note-12-regulatory-matters-tables 85 false false R86.htm 995623 - Disclosure - Note 12 - Regulatory Matters - Schedule of Compliance With Regulatory Capital Requirements Under Banking Regulations (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-12-regulatory-matters-schedule-of-compliance-with-regulatory-capital-requirements-under-banking-regulations-details Note 12 - Regulatory Matters - Schedule of Compliance With Regulatory Capital Requirements Under Banking Regulations (Details) Details 86 false false R87.htm 995624 - Disclosure - Note 13 - Commitments With Off-balance Sheet Risk (Details Textual) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-13-commitments-with-offbalance-sheet-risk-details-textual Note 13 - Commitments With Off-balance Sheet Risk (Details Textual) Details http://www.consumersbancorp.com/20260630/role/statement-note-13-commitments-with-offbalance-sheet-risk 87 false false R88.htm 995625 - Disclosure - Note 14 - Fair Value (Details Textual) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-14-fair-value-details-textual Note 14 - 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Condensed Statements of Income and Comprehensive Income (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-16-parent-company-financial-statements-condensed-statements-of-income-and-comprehensive-income-details Note 16 - Parent Company Financial Statements - Condensed Statements of Income and Comprehensive Income (Details) Details 94 false false R95.htm 995632 - Disclosure - Note 16 - Parent Company Financial Statements - Condensed Statements of Cash Flows (Details) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-16-parent-company-financial-statements-condensed-statements-of-cash-flows-details Note 16 - Parent Company Financial Statements - Condensed Statements of Cash Flows (Details) Details 95 false false R96.htm 995633 - Disclosure - Note 17 - Earnings Per Share (Details Textual) Sheet http://www.consumersbancorp.com/20260630/role/statement-note-17-earnings-per-share-details-textual Note 17 - Earnings Per Share (Details Textual) Details http://www.consumersbancorp.com/20260630/role/statement-note-17-earnings-per-share-tables 96 false false R97.htm 995634 - 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