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Note 3 - Investment Securities (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Debt Securities, Available-for-Sale and Held-to-Maturity, Allowance for Credit Loss   $ 0   $ 0    
Available-for-Sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage   10.10%   10.10%    
Held-to-maturity, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage   36.10%   36.10%    
Debt Securities, Available-for-Sale, Realized Gain   $ 1,000   $ 79,000    
Debt Securities, Available-for-Sale, Realized Loss   95,000   187,000    
Proceeds from Sale of Debt Securities, Available-for-Sale     $ 0 20,202,000 $ 0  
Investment, Number of Shares Acquired (in shares) 90,000          
Investment Ownership Percentage 5.00%          
Payments to Acquire Other Investments $ 1,900,000          
Equity Securities, FV-NI, Unrealized Gain (Loss)   (131,000) (229,000) (86,000) (265,000)  
Equity Securities, FV-NI, Current   1,400,000   1,400,000   $ 1,500,000
Peoples Bancorp, Inc [Member] | Class B Shares of VISA [Member]            
Equity Securities, FV-NI, Cost   0   0    
Equity Securities, FV-NI, Realized Gain (Loss)   157,000 157,000      
Limited Partnership Interest, Technology Fund [Member]            
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount   0 $ 0 0 $ 0  
Limited Partnership Interest, Technology Fund [Member] | Other Assets [Member]            
Equity Securities without Readily Determinable Fair Value, Amount   1,000,000   1,000,000   1,000,000
Limited Partnership Interest, Technology Fund [Member] | Other Liabilities [Member]            
Investment Company, Financial Support to Investee Contractually Required, Not Provided, Amount   $ 580,000   $ 580,000   $ 780,000