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Note 13 - Income (Loss) Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
 
 
Year ended December 31,
 
 
 
2016
 
 
2015
 
 
2014
 
Numerator
 
 
 
 
 
 
 
 
 
 
 
 
Net income (loss)
   $
69,547
     $
(86,968
)
   $
17,824
  
Preferred stock dividends
    
(552
)
    
(552
)
    
(552
)
Net income (loss) applicable to common shares
   $
68,995
     $
(87,520
)
   $
17,272
  
                         
Denominator
 
 
 
 
 
 
 
 
 
 
 
 
Basic weighted average common shares
    
386,416
      
373,954
      
353,442
  
Dilutive stock options, restricted stock units, and warrants
    
2,906
      
—
      
3,993
  
Diluted weighted average common shares
    
389,322
      
373,954
      
357,435
  
                         
Basic earnings (loss) per common share
 
$
0.18
 
 
$
(0.23
)
 
$
0.05
 
Diluted earnings (loss) per common share
 
$
0.18
 
 
$
(0.23
)
 
$
0.05