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Note 8 - Loss Per Common 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,
2017
 
 
June 30,
2016
 
 
June 30,
2017
 
 
June 30,
2016
 
Net loss
   $
(5,888,466
)
   $
(22,495,573
)
   $
(16,956,914
)
   $
(61,774,243
)
Weighted Average Shares - Basic
    
70,329,050
      
2,254,665
      
67,996,330
      
2,073,068
  
Dilutive effect of stock options and restricted stock units
    
—
      
—
      
—
      
—
  
Weighted Average Shares - Diluted
    
70,329,050
      
2,254,665
      
67,996,330
      
2,073,068
  
Basic loss per share *
   $
(0.08
)
   $
(9.98
)
   $
(0.25
)
   $
(29.80
)
Diluted loss per share *
   $
(0.08
)
   $
(9.98
)
   $
(0.25
)
   $
(29.80
)