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Note 4 - Amounts Receivable (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
December 31, 201
9
   
December 31, 2018
 
Research and development incentives
  $
793
    $
622
 
Sales-based taxes receivable
   
13
     
134
 
Other
   
17
     
24
 
Total amounts receivable
  $
823
    $
780