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Note 15 - Stock-based Compensation Plan (Tables)
 12 Months Ended
Dec. 31, 2019
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    
24,900
 
   $
34.10
 
Granted    
9,750
 
    
52.09
 
Vested    
(6,900
)
    
31.43
 
Forfeited    
-
 
    
-
 
                 
Nonvested at end of year    
27,750
 
   $
41.08