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Note 4 - Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2018
Statement Line Items [Line Items]  
Components of trade and other receivables [text block]
      December 31,
2018		       December 31,
2017		  
Goods and services tax ("GST") recoverable   $
22
     $
23
  
Mexican value added tax ("IVA") recoverable    
133
      
30
  
Interest receivable    
217
      
107
  
    $
372
     $
160