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Disclosure - Note 6 - Bank Premises and Equipment - Components of Bank Premises and Equipments (Details) Sheet http://www.bankatfidelity.com/20241231/role/statement-note-6-bank-premises-and-equipment-components-of-bank-premises-and-equipments-details Note 6 - Bank Premises and Equipment - Components of Bank Premises and Equipments (Details) Details 71 false false R72.htm 995615 - Disclosure - Note 7 - Deposits (Details Textual) Sheet http://www.bankatfidelity.com/20241231/role/statement-note-7-deposits-details-textual Note 7 - Deposits (Details Textual) Details http://www.bankatfidelity.com/20241231/role/statement-note-7-deposits-tables 72 false false R73.htm 995616 - Disclosure - Note 7 - Deposits - Maturities of Certificates of Deposits (Details) Sheet http://www.bankatfidelity.com/20241231/role/statement-note-7-deposits-maturities-of-certificates-of-deposits-details Note 7 - Deposits - Maturities of Certificates of Deposits (Details) Details 73 false false R74.htm 995617 - Disclosure - 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Disclosure - Note 9 - FHLB Advances and Other Borrowings - Maturity and Weighted-average Interest Rate of Borrowings (Details) Sheet http://www.bankatfidelity.com/20241231/role/statement-note-9-fhlb-advances-and-other-borrowings-maturity-and-weightedaverage-interest-rate-of-borrowings-details Note 9 - FHLB Advances and Other Borrowings - Maturity and Weighted-average Interest Rate of Borrowings (Details) Details 77 false false R78.htm 995621 - Disclosure - Note 10 - Stock Plans (Details Textual) Sheet http://www.bankatfidelity.com/20241231/role/statement-note-10-stock-plans-details-textual Note 10 - Stock Plans (Details Textual) Details http://www.bankatfidelity.com/20241231/role/statement-note-10-stock-plans-tables 78 false false R79.htm 995622 - Disclosure - Note 10 - Stock Plans - Summary of Weighted Average Fair Value and Vesting of Restricted Stock Grants (Details) Sheet http://www.bankatfidelity.com/20241231/role/statement-note-10-stock-plans-summary-of-weighted-average-fair-value-and-vesting-of-restricted-stock-grants-details Note 10 - Stock Plans - Summary of Weighted Average Fair Value and Vesting of Restricted Stock Grants (Details) Details 79 false false R80.htm 995623 - Disclosure - Note 10 - Stock Plans - Non-vested Restricted Stock (Details) Sheet http://www.bankatfidelity.com/20241231/role/statement-note-10-stock-plans-nonvested-restricted-stock-details Note 10 - Stock Plans - Non-vested Restricted Stock (Details) Details 80 false false R81.htm 995624 - Disclosure - Note 10 - Stock Plans - Summary of SSARs (Details) Sheet http://www.bankatfidelity.com/20241231/role/statement-note-10-stock-plans-summary-of-ssars-details Note 10 - Stock Plans - Summary of SSARs (Details) Details 81 false false R82.htm 995625 - Disclosure - Note 10 - Stock Plans - Stock-based Compensation Expense (Details) Sheet http://www.bankatfidelity.com/20241231/role/statement-note-10-stock-plans-stockbased-compensation-expense-details Note 10 - Stock Plans - Stock-based Compensation Expense (Details) Details 82 false false R83.htm 995626 - Disclosure - Note 10 - Stock Plans - Unrecognized Stock-based Compensation Expense (Details) Sheet http://www.bankatfidelity.com/20241231/role/statement-note-10-stock-plans-unrecognized-stockbased-compensation-expense-details Note 10 - Stock Plans - Unrecognized Stock-based Compensation Expense (Details) Details 83 false false R84.htm 995627 - Disclosure - Note 11 - Income Taxes (Details Textual) Sheet http://www.bankatfidelity.com/20241231/role/statement-note-11-income-taxes-details-textual Note 11 - Income Taxes (Details Textual) Details http://www.bankatfidelity.com/20241231/role/statement-note-11-income-taxes-tables 84 false false R85.htm 995628 - Disclosure - Note 11 - Income Taxes - Deferred Tax Assets and Liabilities (Details) Sheet http://www.bankatfidelity.com/20241231/role/statement-note-11-income-taxes-deferred-tax-assets-and-liabilities-details Note 11 - Income Taxes - Deferred Tax Assets and Liabilities (Details) Details 85 false false R86.htm 995629 - Disclosure - Note 11 - 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