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Note 9 - Pledged Collateral Related to Securities Sold Under Repurchase Agreements (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block]
   

2023

   

2022

 

Securities sold under agreements to repurchase:

               

U.S. government treasuries

  $ 22,877     $ 12,555  

U.S. government agencies

    44,960       39,226  

U.S. government mortgage-backed securities

    7,369       9,133  
                 

Total pledged collateral

  $ 75,206     $ 60,914  
Schedule of Repurchase Agreements [Table Text Block]
   

2023

   

2022

 
                                 
           

Average

           

Average

 
   

Balance

   

Rate

   

Balance

   

Rate

 
                                 

Repurchase agreements

  $ 53,994       2.83 %   $ 40,676       2.50 %