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Note 2 - Securities (Details Textual)
$ 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 ($)
Par Value of Restricted Stock Out of Outstanding Capital Required by FRB 3.00%   3.00%    
Percentage of Par Value of Federal Reserve Banks Restricted Stock Outstanding Capital Subject to Call 3.00%   3.00%    
Par Value of Restricted Stock Out of Outstanding Borrowings Required by FHLB 3.75%   3.75%    
Other than Temporary Impairment Losses, Investments, Total     $ 0   $ 0
Debt Securities, Available-for-Sale, Realized Gain (Loss), Total $ 0 $ 0 0 $ 0  
Proceeds from Sale of Debt Securities, Available-for-Sale $ 0 $ 0 0 $ 0  
Investment in Federal Home Loan Bank Stock [Member]          
Other than Temporary Impairment Losses, Investments, Total     $ 0    
US Treasury Securities [Member]          
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 22   22    
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total     $ 0    
US Government-sponsored Enterprises Debt Securities [Member]          
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 45   45    
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total     $ 0    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 20   20    
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]          
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 142   142    
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total     $ 0    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 17   17    
Collateralized Mortgage-Backed Securities [Member]          
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 56   56    
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total     $ 0    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 27   27    
US States and Political Subdivisions Debt Securities [Member]          
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 85   85    
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total     $ 0    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 29   29    
Corporate Debt Securities [Member]          
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions 13   13    
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total     $ 0    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 3   3