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Note 7 - Securities Sold Under Agreements to Repurchase (Tables)
 12 Months Ended
Dec. 31, 2023
Notes Tables  
Schedule of Repurchase Agreements [Table Text Block]

(Dollars in thousands)

 2023  2022 
         

Outstanding balance at year end

 $229,734  $194,340 

Weighted average interest rate at year end

  3.17%  0.75%
         

Average daily balance during the year

 $204,334  $200,499 

Weighted average interest rate during the year

  1.33%  0.15%
         

Maximum daily balance during the year

 $269,324  $235,577