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Note 3 - Prepaid Expenses and Other Current Assets (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
   
March 31,
2021
   
December 31,
2020
 
                 
Prepaid expenses
  $
1,000
    $
1,030
 
Tax Receivable – Canadian GST
   
1,801
     
5,052
 
    $
2,801
    $
6,082