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Note 2 - Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
   
2017
    
2016
    
2015
  
Weighted-average common shares outstanding
    
3,415,115
      
2,494,022
      
2,251,365
  
                         
Average treasury stock shares
    
(386,165
 )    
(386,165
 )    
(236,399
 )
                         
Weighted-average common shares and common stock equivalents used to calculate basic earnings per share
    
3,028,950
      
2,107,857
      
2,014,966
  
                         
Additional common stock equivalents (stock options) used to calculate diluted earnings per share
    
23,635
      
11,357
      
9,154
  
                         
Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share
    
3,052,585
      
2,119,214
      
2,024,120