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Note 11 - Share-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
   
Year Ended
  
   
December 31,
  
   
2019
    
2018
  
Share-based compensation:
                
Equity awards
   $
(8,525
 )   $
19,032
  
Liability awards
    
—
      
(2,400
 )
Total share-based compensation
    
(8,525
 )    
16,632
  
Capitalized share-based compensation
    
(1,121
 )    
208
  
Total share-based compensation expense
   $
(9,646
 )   $
16,840
  
Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block]
   
Shares
    
Weighted Average Grant Date Fair Value Per Share
  
Non-vested at January 1, 2019
    
7,131
     $
9.44
  
Granted
    
1,878
      
5.72
  
Vested
    
(510
 )    
7.70
  
Forfeited
    
(3,727
 )    
9.67
  
Non-vested at December 31, 2019
    
4,772
     $
7.95