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Note 13 - Unaudited Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
Predecessor
 
  
Successor
  
   
First
Quarter
    
Second
Quarter
    
Third
Quarter
    
Period from
October 1
Through
November 14, 2017
    
Period from
November 15
Through
December 31, 2017
  
   
(In thousands, except per share amounts)
        
2017
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Revenues
   $
24,359
     $
24,641
     $
25,805
     $
13,424
     $
13,593
  
Operating loss
    
(31,992
 )    
(30,680
 )    
(18,202
 )    
(9,308
 )    
(21,859
 )
Net loss
    
(124,815
 )    
(40,547
 )    
(24,643
 )    
(210,914
 )    
3,511
  
Per share (basic)
   $
(4.93
 )   $
(1.58
 )   $
(0.94
 )   $
(8.13
 )   $
0.35
  
Per share (diluted)
   $
(4.93
 )   $
(1.58
 )   $
(0.94
 )   $
(8.13
 )   $
0.35
  
   
Predecessor
 
   
First
    
Second
    
Third
    
Fourth
  
   
Quarter
    
Quarter
    
Quarter
    
Quarter
  
   
(In thousands, except per share amounts)
  
2016
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Revenues
   $
38,794
     $
30,487
     $
27,821
     $
26,617
  
Operating loss
    
(128,256
 )    
(66,338
 )    
(19,766
 )    
(16,965
 )
Net loss
    
(91,182
 )    
(47,580
 )    
(24,729
 )    
(39,488
 )
Per share (basic)
   $
(3.66
 )   $
(1.90
 )   $
(0.98
 )   $
(1.57
 )
Per share (diluted)
   $
(3.66
 )   $
(1.90
 )   $
(0.98
 )   $
(1.57
 )