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Note 10 - Warrant Liabilities (Tables)
 6 Months Ended
Jun. 30, 2018
Warrant [Member]  
Notes Tables  
Schedule of Derivative Liabilities at Fair Value [Table Text Block]
   
2016 Purchase
  
   
Agreement
  
         
Beginning Balance - December 31, 2017
   $
2,192
  
Change in value of warrant liabilities, (gain)
    
(8
 )
Exercises
    
-
  
Ending Balance - June 30, 2018
   $
2,184