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Note 3 - Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
   
For the Three
    
For the Nine
  
   
Months Ended
    
Months Ended
  
   
September 30,
    
September 30,
  
                         
   
2017
    
2016
    
2017
    
2016
  
Weighted-average common shares outstanding
    
3,598,500
      
2,633,752
      
3,352,316
      
2,445,821
  
                                 
Average treasury stock shares
    
(386,165
 )    
(386,165
 )    
(386,165
 )    
(386,165
 )
                                 
Weighted-average common shares and common stock equivalents used to calculate basic earnings per share
    
3,212,335
      
2,247,587
      
2,966,151
      
2,059,656
  
                                 
Additional common stock equivalents (stock options) used to calculate diluted earnings per share
    
11,418
      
8,643
      
12,592
      
8,876
  
                                 
Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share
    
3,223,753
      
2,256,230
      
2,978,743
      
2,068,532