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Note 9 - Stock-based Compensation Plan (Tables)
 3 Months Ended
Mar. 31, 2024
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

  5,600  $63.60 

Granted

  3,150   28.00 

Vested

  -   - 

Forfeited

  -   - 
         

Nonvested at end of year

  8,750  $50.78