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Note 5 - Trade Accounts Receivable
3 Months Ended
Mar. 31, 2021
Notes to Financial Statements  
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
5.
Trade Accounts Receivable
 
Trade accounts receivable were comprised of the following:
 
   
March 31,
   
December 31,
 
   
2021
   
2020
 
Trade accounts receivable
  $
288
    $
505
 
Less: Allowance for doubtful accounts
   
(234
)    
(234
)
Trade accounts receivable
  $
54
    $
271