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Note 10 - Share-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
   
Three months ended
    
Nine months ended
  
   
September 30,
    
September 30,
  
   
2019
    
2018
    
2019
    
2018
  
Share-based compensation:
                                
Equity awards
   $
(4,648
 )   $
2,451
     $
(11,738
 )   $
13,169
  
Liability awards    
—
      
(1,153
 )    
(20
 )    
977
  
Total share-based compensation
    
(4,648
 )    
1,298
      
(11,758
 )    
14,146
  
Capitalized share-based compensation    
(71
 )    
183
      
(780
 )    
(1,415
)
Total share-based compensation expense
   $
(4,719
 )   $
1,481
     $
(12,538
 )   $
12,731