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Note 3 - Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
   
For the Three
  
   
Months Ended
  
   
March 31,
  
   
2017
    
2016
  
Weighted-average common shares outstanding
    
3,065,981
     
2,264,342
  
                 
Average treasury stock shares
    
(386,165
 )    
(386,165
 )
                 
Weighted-average common shares and common stock equivalents used to calculate basic earnings per share
    
2,679,816
     
1,878,177
 
                 
Additional common stock equivalents (stock options) used to calculate diluted earnings per share
    
12,199
     
8,766
 
                 
Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share
    
2,692,015
     
1,886,943