Note 15 - Income Taxes (Details Textual)	12 Months Ended
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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