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Note 4 - Loans, Allowance for Credit Losses and Credit Quality (Details Textual) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2026 USD ($) | Mar. 31, 2025 USD ($) | Dec. 31, 2025 USD ($)
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss | $ 1,391,489,000 |  | $ 1,371,819,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss | 4,700,000 |  | 4,600,000
Financing Receivable, Nonaccrual, Interest Income | 16,000 | $ 39,000 | 99,000
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount | 0 | $ 0 |
Commercial Loan [Member] |  |  |
Financing Receivable, Excluding Accrued Interest, Threshold for Credit Assessement | 500,000 |  |
Real Estate Loan [Member] |  |  |
Financing Receivable, Excluding Accrued Interest, Threshold for Credit Assessement | $ 2,000,000 |  |
Consumer Loan [Member] | Residential Real Estate [Member] | Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Number of Contracts in Process of Foreclosure | 1 |  |
Mortgage Loans in Process of Foreclosure, Amount | $ 103,000 |  | 0
Asset Pledged as Collateral [Member] | Federal Home Loan Bank Advances [Member] |  |  |
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss | 919,200,000 |  | 920,900,000
Asset Pledged as Collateral [Member] | Federal Reserve Bank [Member] |  |  |
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss | $ 118,700,000 |  | $ 114,700,000

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- Definition Amount, after allowance for credit loss, of accrued interest on financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-5 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3A + Details
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