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Note 4 - Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three months ended
    
Six months ended
  
   
June 30,
    
June 30,
  
   
2017
   
2016
   
2017
   
2016
 
                                 
Net income
   $
8,766,017
     $
6,676,467
     $
17,950,982
     $
13,049,956
  
                                 
Basic EPS
   $
0.67
     $
0.54
     $
1.36
     $
1.08
  
Diluted EPS
   $
0.65
     $
0.53
     $
1.33
     $
1.07
  
                                 
Weighted average common shares outstanding
    
13,170,283
      
12,335,077
      
13,151,833
      
12,064,349
  
Weighted average common shares issuable upon exercise of stock options and under the employee stock purchase plan
    
346,309
      
181,397
      
350,672
      
170,863
  
Weighted average common and common equivalent shares outstanding
    
13,516,592
      
12,516,474
      
13,502,505
      
12,235,212