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Note 9 - Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three months ended June 30,
    
Six months ended June 30,
  
   
2018
    
2017
    
2018
    
2017
  
Numerator
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net income (loss)
   $
10,203,436
     $
(3,487,971
 )   $
15,469,713
     $
(6,581,114
 )
Denominator
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Weighted average shares used to compute basic EPS
    
40,082,467
      
39,072,394
      
39,994,386
      
35,592,366
  
Dilutive effect of share-based awards
(a)
    
257,282
      
-
      
247,531
      
-
  
Weighted average shares used to compute diluted EPS
    
40,339,749
      
39,072,394
      
40,241,917
      
35,592,366
  
                                 
Earnings per share
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Basic
   $
0.25
     $
(0.09
 )   $
0.39
     $
(0.18
 )
Diluted
   $
0.25
     $
(0.09
 )   $
0.38
     $
(0.18
 )