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Note 14 - Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
Successor
  
   
Quarters Ended
  
   
March 31,
2017
    
June 30,
2017
    
September 30,
2017
    
December 31,
2017
  
Revenue
   $
314,194
     $
390,143
     $
442,652
     $
491,750
  
Operating income (loss)
    
(36,408
)
    
(13,244
)
    
6,412
      
27,462
  
Income (loss) before income taxes
    
(35,537
)
    
(15,114
)
    
7,357
      
25,991
  
Net income (loss)
    
(32,301
)
    
(12,721
)
    
10,484
      
56,995
  
Net income (loss) per common share:
                                
Basic
   $
(0.58
)
   $
(0.20
)
   $
0.17
     $
0.89
  
Diluted
   $
(0.58
)
   $
(0.20
)
   $
0.17
     $
0.88
  
   
Predecessor
  
   
Quarters Ended
  
   
March 31,
2016
    
June 30,
2016
    
September 30,
2016
    
December 31,
2016
  
Revenue
   $
269,615
     $
225,168
     $
232,537
     $
243,822
  
Operating loss
    
(500,416
)
    
(182,437
)
    
(85,553
)
    
(101,602
)
Loss before reorganization items and income taxes
    
(522,560
)
    
(302,368
)
    
(86,636
)
    
(106,405
)
Net loss
    
(428,412
)
    
(291,116
)
    
(106,390
)
    
(118,371
)
Net loss per common share:
                                
Basic
   $
(3.65
)
   $
(2.46
)
   $
(0.90
)
   $
(1.00
)
Diluted
   $
(3.65
)
   $
(2.46
)
   $
(0.90
)
   $
(1.00
)