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Note 8 - Securities Sold Under Agreements to Repurchase (Tables)
 12 Months Ended
Dec. 31, 2022
Notes Tables  
Schedule of Repurchase Agreements [Table Text Block]
   

2022

    

2021

  
                 

Outstanding balance at year-end

   $ 194,340,000     $ 197,463,000  

Weighted average interest rate at year-end

     0.75

%

     0.11

%
                 

Average daily balance during the year

   $ 200,499,000     $ 158,855,000  

Weighted average interest rate during the year

     0.15

%

     0.11

%
                 

Maximum daily balance during the year

   $ 235,577,000     $ 209,093,000