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Note 3 - Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
   
2019
    
2018
  
                 
Weighted-average common shares issued
    
7,286,554
      
7,232,238
  
                 
Average treasury stock shares
    
(816,146
 )    
(772,330
 )
                 
Weighted-average common shares and common stock equivalents used to calculate basic earnings per share
    
6,470,408
      
6,459,908
  
                 
Additional common stock equivalents (stock options and restricted stock) used to calculate diluted earnings per share
    
32,398
      
27,906
  
                 
Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share
    
6,502,806
      
6,487,814