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Note 2 - Basis of Presentation and Recent Accounting Pronouncements (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Fair Value
   
Level 1
   
Level 2
   
Level 3
 
                                 
Warrant liabilities (long-term)
   
1,599
     
-
     
1,599
     
-
 
   
Fair Value
   
Level 1
   
Level 2
   
Level 3
 
                                 
Warrant liabilities (long-term)
   
2,192
     
-
     
2,192
     
-