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Note 7 - Loans and Related Allowance for Credit Losses (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Financing Receivable, Accrued Interest, after Allowance for Credit Loss $ 5,500,000 $ 5,500,000  
Financing Receivable, Deferred Commitment Fee 8,200,000 9,200,000  
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) $ 754,000    
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease), Percentage 3.50%    
Financing Receivable, before Allowance for Credit Loss, Total [1],[2] $ 1,519,614,000 1,478,130,000  
Financing Receivable, Nonaccrual, Interest Income 2,300,000 689,000  
Financing Receivable, Allowance for Credit Loss 22,447,000 [1],[2] 21,693,000 [1],[2] $ 14,438,000
Provision for Loan, Lease, and Other Losses $ 2,190,000 $ 1,842,000  
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Interest Receivable and Other Assets Interest Receivable and Other Assets  
Threshold For Loans Evaluated For Impairment [Member]      
Financing Receivable, before Allowance for Credit Loss, Total $ 750,000    
Threshold For Loans Evaluated For Impairment [Member] | Criticized Relationships [Member]      
Financing Receivable, before Allowance for Credit Loss, Total 150,000    
Unfunded Loan Commitment [Member]      
Financing Receivable, Allowance for Credit Loss 1,600,000 $ 1,800,000  
Provision for Loan, Lease, and Other Losses $ 182,000 $ 1,800,000  
[1] Accrued interest of $5.5 million and $5.5 million at December 31, 2024 and December 31, 2023, respectively, is excluded from amortized cost and presented in "accrued interest receivable and other assets" on the Consolidated Balance Sheets.
[2] Unearned income, including net deferred loan fees and costs and unamortized premiums and discounts, totaled $8.2 million and $9.2 million at December 31, 2024 and 2023, respectively.