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Note 11 - Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Quarterly Financial Information [Table Text Block]
    First   Second   Third   Fourth
2016 Quarters                                
Revenues   $
4,820
     $
4,787
     $
7,763
     $
8,983
  
Net Loss    
(22,832
 )    
(16,281
 )    
(11,528
 )    
(4,503
 )
Basic and diluted net loss per share    
(0.31
 )    
(0.22
 )    
(0.16
 )    
(0.06
 )
2015 Quarters                                
Revenues   $
6,826
     $
25,842
     $
10,987
     $
4,602
  
Net (Loss) Income    
(15,164
 )    
4,901
      
(14,621
 )    
(18,135
 )
Basic net (loss) income per share    
(0.21
 )    
0.07
      
(0.20
 )    
(0.25
 )
Diluted net (loss) income per share    
(0.21
 )    
0.06
      
(0.20
 )    
(0.25
 )