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Note 11 - Share-based Compensation (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
   
Three Months Ended
  
   
March 31,
  
   
2020
    
2019
  
Share-based compensation:
                
Equity awards
   $
(1,600
 )   $
5,884
  
Liability awards
    
—
      
—
  
Total share-based compensation
    
(1,600
 )    
5,884
  
Capitalized share-based compensation
    
(260
 )    
(546
 )
Total share-based compensation expense
   $
(1,860
 )   $
5,338