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Note 9 - Allowance for Loan Losses and Credit Quality Information (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended 21 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest $ 1,811   $ 1,811   $ 1,811   $ 4,621    
Impaired Financing Receivable, Related Allowance 148   148   148   406    
Loan Receivable for Which Value of Collateral Sufficient to Repay 1,000   1,000   1,000   900    
Financing Receivable, Troubled Debt Restructuring $ 746   $ 746   746   1,051    
Financing Receivable, Modifications, Number of Contracts 1 1 2 4          
Financing Receivable, Troubled Debt Restructuring, Subsequent Default $ 162 $ 0 $ 162 $ 0          
Financing Receivable, Troubled Debt Restructuring, Reserves $ 100   $ 100   $ 100   $ 200    
Percentage Reserves For Loan Losses On Troubled Debt Restructurings 0.70%   0.70%   0.70%   2.60%    
Loans and Leases Receivable, Allowance $ 10,141 9,070 $ 10,141 9,070 $ 10,141 $ 9,644 $ 9,279 $ 9,915 $ 10,699
Financing Receivable, Deferred Loans with Granted Loan Modifications 0 $ 25,500 0 $ 25,500 0        
Nonperforming Financial Instruments [Member]                  
Impaired Financing Receivable, Related Allowance 100   100   100   400    
Financing Receivable, Troubled Debt Restructuring 545   545   545   1,022    
Performing Financial Instruments [Member]                  
Financing Receivable, Troubled Debt Restructuring $ 201   $ 201   $ 201   $ 29    
Performing Financial Instruments [Member] | Classified [Member]                  
Financing Receivable, Modifications, Number of Contracts     0   0