Note 4 - Trade Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
 
 
December 31,
 
 
 
2016
 
 
2015
 
Trade accounts receivable
   $
95
    $
30
 
Less: Allowance for doubtful accounts
    
-
     
-
 
Trade accounts receivable, net
   $
95
    $
30