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Note 9 - Debt (Tables)
 6 Months Ended
Jun. 30, 2018
Convertible 2020 Notes [Member]  
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
Principal
Amount
of 2020 Notes
    
Debt
Discount
    
Debt Issue
Costs
    
Total 2020
Notes
    
2020 Notes
Embedded
Derivative
    
Total 2020
Notes and 2020
Notes
Embedded
Derivative
  
Balance - December 31, 2017
   $
16,657
     $
(2,501
)
   $
(665
)
   $
13,491
     $
5,224
     $
18,715
  
Amortization of debt discount
    
-
      
566
      
-
      
566
      
-
      
566
  
Amortization of debt issue costs
    
-
      
-
      
150
      
150
      
-
      
150
  
Paid-in-kind interest
    
168
      
-
      
-
      
168
      
-
      
168
  
Change in fair value of 2020 Notes embedded derivative    
-
      
-
      
-
      
-
      
(2,347
 )    
(2,347
 )
Conversion of 2020 Notes into common stock
    
(3,186
 )    
428
      
114
      
(2,644
 )    
(2,193
 )    
(4,837
 )
Balance - June 30, 2018
   $
13,639
     $
(1,507
)
   $
(401
)
   $
11,731
     $
684
     $
12,415
  
 
Principal
Amount
of 2022 Notes
  
Balance - December 31, 2017
 $
515
  
Exchange of 2022 Notes
  
(515
)
Balance – June 30, 2018
 $
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