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Note 3 - Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
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,
  
                         
   
2017
    
2016
    
2017
    
2016
  
Weighted-average common shares
outstanding
    
3,386,616
     
2,437,302
     
3,227,184
     
2,350,822
 
                                 
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
    
3,000,451
     
2,051,137
     
2,841,019
     
1,964,657
 
                                 
Additional common stock equivalents
(stock options) used to calculate
diluted earnings per share
    
13,689
     
8,274
     
13,139
     
8,522
 
                                 
Weighted-average common shares and
common stock equivalents used
to calculate diluted earnings per share
    
3,014,140
     
2,059,411
     
2,854,158
     
1,973,179