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Note 5 - Trade Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
December 31,
 
   
2019
   
2018
 
Trade accounts receivable
  $
311
    $
120
 
Less: Allowance for doubtful accounts
   
(8
)    
-
 
Trade accounts receivable
  $
303
    $
120