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Note 3 - Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
   
2018
    
2017
  
                 
Weighted-average common shares issued
    
3,616,119
      
3,415,115
  
                 
Average treasury stock shares
    
(386,165
 )    
(386,165
 )
                 
Weighted-average common shares and common stock equivalents used to calculate basic earnings per share
    
3,229,954
      
3,028,950
  
                 
Additional common stock equivalents (stock options and restricted stock) used to calculate diluted earnings per share
    
13,953
      
23,635
  
                 
Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share
    
3,243,907
      
3,052,585