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Note 3 - Long-term Borrowings (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
December 31,
  
   
2017
    
 
2016
  
Convertible notes payable
   $
-
     $
250
  
Less unamortized discount
    
-
      
(4
)
                 
Notes Payable due July, 2022
    
1,995
      
945
  
Accrued interest
– long term
    
47
      
-
  
Less unamortized discount and debt issuance costs
    
(386
)
    
(120
)
     
1,656
      
1,071
  
Current portion of long-term borrowing
    
-
      
(246
)
Non-current portion of long-term borrowing
   $
1,656
     $
825
  
Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]
2018
   $
-
  
2019
    
-
  
2020
    
-
  
2021
    
-
  
2022
    
2,042
  
Total
   $
2,042