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Note 3 - Long-term Borrowings (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
March 31
,
2018
   
December 31,
2017
 
Notes Payable due July 2022
  $
1,995
    $
1,995
 
Accrued interest – long term
   
71
     
47
 
Less unamortized discount and debt issuance costs
   
(364
)
   
(386
)
     
1,702
     
1,656
 
Current portion of long-term borrowing
   
-
     
-
 
Non-current portion of long-term borrowing
  $
1,702
    $
1,656