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Note 5 - Trade Accounts Receivable (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
September 30,
   
December 31,
 
   
2020
   
2019
 
Trade accounts receivable
  $
416
    $
311
 
Less: Allowance for doubtful accounts
   
(234
)    
(8
)
Trade accounts receivable
  $
182
    $
303