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Note 9 - Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three months ended September 30,
    
Nine months ended September 30,
  
   
2018
    
2017
    
2018
    
2017
  
Numerator
                                
Net income (loss)
   $
6,211,328
     $
(6,235,543
 )   $
21,681,041
     $
(12,816,658
 )
Denominator
                                
Weighted average shares used to compute basic EPS
    
40,082,467
      
39,509,311
      
40,024,069
      
36,912,362
  
Dilutive effect of share-based awards
(a)
    
246,842
      
-
      
247,090
      
-
  
Weighted average shares used to compute diluted EPS
    
40,329,309
      
39,509,311
      
40,271,159
      
36,912,362
  
                                 
Earnings per share
                                
Basic
   $
0.15
     $
(0.16
 )   $
0.54
     $
(0.35
 )
Diluted
   $
0.15
     $
(0.16
 )   $
0.54
     $
(0.35
 )