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Note 15 - Stock-based Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
      

Weighted

 
  

Number

  

Average

 
  

of

  

Grant-Date

 
  

Shares

  

Fair Value

 
         

Nonvested at beginning of year

  12,550  $57.07 

Granted

  -   - 

Vested

  6,100   51.12 

Forfeited

  850   56.76 
         

Nonvested at end of year

  5,600  $63.60