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Note 15 - Income Taxes (Details Textual) | 12 Months Ended
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Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Deferred Tax Assets, Gross | $ 27,946,000 | $ 24,468,000 |
Deferred Tax Liabilities, Gross | 13,453,000 | 8,736,000 |
Deferred Tax Assets, Net | 14,493,000 | 15,732,000 |
Deferred Tax Assets, Valuation Allowance | 0 |  |
Income Tax Examination, Penalties and Interest Accrued | $ 0 | $ 0 |
Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration] | Interest Receivable and Other Assets | Interest Receivable and Other Assets |
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration] | Income Tax Expense (Benefit) |  |
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Cash Flows [Extensible Enumeration] | Cash Provided by (Used in) Operating Activity, Including Discontinued Operation |  |
Low Income Housing Tax Credit Funds [Member] |  |  |
Investment, Proportional Amortization Method, Elected, Amount | $ 6,790,000 | $ 2,150,000 |
Investment Program, Proportional Amortization Method, Elected, Commitment | 4,249,000 |  |
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization Expense | 382,359 | $ 305,928 | $ 142,691
Green Energy Tax Credits [Member] |  |  |
Investment, Proportional Amortization Method, Elected, Amount | 10,000,000 |  |
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit | 700,000 |  |
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization Expense | 9,300,000 |  |
Investment Program, Proportional Amortization Method, Elected, Impairment Loss | $ 0 |  |
Green Energy Tax Credits [Member] | Measurement Input, Discount Rate [Member] |  |  |
Investment Program, Measurement Input | 7 |  |
Domestic Tax Jurisdiction [Member] |  |  |
Operating Loss Carryforwards | $ 2,762,000 |  |
State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards | $ 1,987,000 |  |

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