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Note 4 - Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
   
For the Three
    
For the Six
  
   
Months Ended
    
Months Ended
  
   
June 30,
    
June 30,
  
   
2018
    
2017
    
2018
    
2017
  
Weighted-average common shares outstanding
    
3,611,891
      
3,386,616
      
3,609,174
      
3,227,184
  
                                 
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
    
3,225,726
      
3,000,451
      
3,223,009
      
2,841,019
  
                                 
Additional common stock equivalents (stock options and restricted stock) used to calculate diluted earnings per share
    
14,603
      
13,689
      
15,227
      
13,139
  
                                 
Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share
    
3,240,329
      
3,014,140
      
3,238,236
      
2,854,158