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Note 14 - Income (Loss) Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Year ended December 31,
  
   
2018
    
2017
    
2016
  
Numerator
  
 
 
 
  
 
 
 
  
 
 
 
Net income (loss)
   $
(26,563
)
   $
(28,520
)
   $
61,569
  
Preferred stock dividends
    
(552
)
    
(552
)
    
(552
)
Net income (loss) applicable to common shares
   $
(27,115
)
   $
(29,072
)
   $
61,017
  
                         
Denominator
  
 
 
 
  
 
 
 
  
 
 
 
Basic weighted average common shares
    
433,419
      
397,394
      
386,416
  
Dilutive stock options, restricted stock units, and warrants
    
—
      
—
      
2,906
  
Diluted weighted average common shares
    
433,419
      
397,394
      
389,322
  
                         
Basic earnings (loss) per common share
  
$
(0.06
)
  
$
(0.07
)
  
$
0.16
  
Diluted earnings (loss) per common share
  
$
(0.06
)
  
$
(0.07
)
  
$
0.16