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Note 7 - Loans and Allowance for Credit Losses on Loans (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accrued Interest and Fees Receivable on Loans $ 10,400,000 $ 7,200,000  
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums $ 4,600,000 4,000,000.0  
Number of Days Past Due When Loans are Placed on Nonaccrual Status (Day) 90 days    
Financing Receivable, Troubled Debt Restructuring $ 20,600,000 20,900,000  
Current Troubled Debt Restructurings 18,600,000 18,700,000  
Commitments to Lend Funds for Restructured Loans 0 0  
Financing Receivable Troubled Debt Restructuring Individually Evaluated for Impairment Minimum $ 500,000    
Threshold Period Past Due for Loans to be Default (Day) 30 days    
Loan Review Aggregate Exposure Amount on Nonhomogeneous Commercial Loan Relationships $ 5,000,000.0    
Concentrations of Loans to Any Single Industry in Excess of 10% of Total Loans 0 0  
Loans and Leases Receivable, Related Parties, Ending Balance 49,309,000 53,212,000 $ 55,092,000
Loans Collectively Evaluated Fully Guaranteed or Cash Secured Loans 8,500,000 $ 19,800,000  
Minimum [Member]      
Residential 1-4 Family Rental Small Loan / Large Loan Classification 600,000    
Minimum [Member] | Any One Related Party [Member]      
Loans and Leases Receivable, Related Parties, Ending Balance 60,000    
Maximum [Member]      
Residential 1-4 Family Rental Small Loan / Large Loan Classification $ 600,000