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Note 4 - Loans Receivable (Details Textual) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Unamortized Loan Cost (Fee) | $ 1,700,000 | $ 1,600,000 |
Financing Receivable, Allowance for Credit Loss | 8,345,000 | 8,129,000 | $ 6,715,000
Financing Receivable, Accrued Interest, before Allowance for Credit Loss | 1,400,000 | 38,000 |
Financing Receivable, Modified, Accumulated | 0 | $ 0 |
Equipment Finance Portfolio [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss | 303,300,000 |  |
Small Business Equipment Finance [Member] | Credit Exposure To 529 Obligors [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 32,200,000 |  |
Residential Mortgage [Member] | First Mortgage [Member] |  |  |
Percent Threshold On Loan To Value Ratios Requiring Private Mortgage Insurance | 80.00% |  |
Nonresidential Real Estate Loans [Member] |  |  |
Projected Cash Flow To Loan Debt Service Requirement | 120.00% |  |
Nonresidential Real Estate Loans [Member] | Fixed Rate Nonresidential Mortgage [Member] |  |  |
Loans and Leases Receivable, Amortization Period (Year) | 15 years |  |
U.S. Government 31 Departments or Agencies [Member] | Equipment Finance Portfolio [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 82,300,000 |  |
U.S. Government 31 Departments or Agencies [Member] | Equipment Finance Portfolio [Member] | Ten Largest Exposures [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss | 71,500,000 |  |
Seventy Six State or Local Governments [Member] | Equipment Finance Portfolio [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss | 50,000,000 |  |
Seventy Six State or Local Governments [Member] | Equipment Finance Portfolio [Member] | Ten Largest Exposures [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss | 33,400,000 |  |
Middle-market Obligors and 214 Corporate [Member] | Commercial Equipment Finance [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss | 138,800,000 |  |
Middle-market Obligors and 214 Corporate [Member] | Commercial Equipment Finance [Member] | Ten Largest Exposures [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss | 50,900,000 |  |
Commercial leases [Member] |  |  |
Loans and Lease Receivables Outstanding Credit Exposure, Average Amount | 814,000 |  |
Unfunded Loan Commitment [Member] | Other Liabilities [Member] |  |  |
Financing Receivable, Allowance for Credit Loss | $ 335,000 |  |
Minimum [Member] | Multi Family Mortgage Loans [Member] |  |  |
Loan Amount To Appraised Value Of Property Securing Loan, Percentage | 65.00% |  |
Minimum [Member] | Nonresidential Real Estate Loans [Member] |  |  |
Loan Amount To Appraised Value Of Property Securing Loan, Percentage | 65.00% |  |
Mortgage Loans on Real Estate, Maturity (Year) | 3 years |  |
Loans and Leases Receivable, Amortization Period (Year) | 20 years |  |
Maximum [Member] | Multi Family Mortgage Loans [Member] |  |  |
Loan Amount To Appraised Value Of Property Securing Loan, Percentage | 80.00% |  |
Maximum [Member] | Nonresidential Real Estate Loans [Member] |  |  |
Loan Amount To Appraised Value Of Property Securing Loan, Percentage | 80.00% |  |
Mortgage Loans on Real Estate, Maturity (Year) | 5 years |  |
Loans and Leases Receivable, Amortization Period (Year) | 30 years |  |
Maximum [Member] | Equipment Finance [Member] |  |  |
Commercial Leases Maturity (Year) | 5 years |  |
Maximum [Member] | Commercial leases [Member] |  |  |
Loans And Lease Receivables, Outstanding Credit Exposure | $ 24,000,000 |  |
Weighted Average [Member] | Small Business Equipment Finance [Member] | Credit Exposure To 529 Obligors [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss | 53,000 |  |
Weighted Average [Member] | U.S. Government 31 Departments or Agencies [Member] | Equipment Finance Portfolio [Member] | Ten Largest Exposures [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss | 3,200,000 |  |
Weighted Average [Member] | Seventy Six State or Local Governments [Member] | Equipment Finance Portfolio [Member] | Ten Largest Exposures [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss | 819,000 |  |
Weighted Average [Member] | Middle-market Obligors and 214 Corporate [Member] | Commercial Equipment Finance [Member] | Ten Largest Exposures [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 727,000 |  |
Collateralized Loan [Member] | Multi Family Mortgage Loans [Member] |  |  |
Collateralized Loan Receivable, Percentage Of Collateral Located Outside Primary Market Area | 40.00% |  |
Projected Cash Flow To Loan Debt Service Requirement | 120.00% |  |
Collateralized Loan [Member] | Minimum [Member] | Multi Family Mortgage Loans [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 500,000 |  |
Collateralized Loan [Member] | Minimum [Member] | Nonresidential Real Estate Loans [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss | 500,000 |  |
Collateralized Loan [Member] | Maximum [Member] | Multi Family Mortgage Loans [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss | 8,500,000 |  |
Collateralized Loan [Member] | Maximum [Member] | Nonresidential Real Estate Loans [Member] |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 7,500,000 |  |

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