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Note 9 - Stock-based Compensation Plan (Tables)
3 Months Ended
Mar. 31, 2025
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 period

    4,800     $ 43.40  

Granted

    3,900       37.90  

Vested

    -       -  

Forfeited

    -       -  
                 

Nonvested at end of period

    8,700     $ 40.93