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Note 8 - Loans and Related Allowance for Loan and Lease Losses (Details Textual)
Pure in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Loans and Leases Receivable, Deferred Income $ 1,900,000   $ 1,900,000   $ 3,600,000
Financing Receivable, Troubled Debt Restructuring 2,800,000   2,800,000   2,600,000
Financing Receivable, Allowance for Credit Loss, Writeoff     $ 308,000   150,000
Number of Days Past Due (Day)     90 days    
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans $ 39,000 $ 107,000 $ 120,000 $ 290,000  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts 0   0    
Threshold For Loans Evaluated For Impairment [Member]          
Loans and Leases Receivable, before Fees, Gross $ 750,000   $ 750,000    
Threshold For Loans Evaluated For Impairment [Member] | Outside Consultant [Member]          
Loans and Leases Receivable, before Fees, Gross 250,000   250,000    
Threshold For Loans Evaluated For Impairment [Member] | Criticized Relationships [Member]          
Financing Receivable, before Allowance for Credit Loss, Total 150,000   150,000    
Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member]          
Loans and Leases Receivable, Deferred Income $ 14,000   $ 14,000   $ 1,300,000