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Note 5 - Investments (Tables)
 12 Months Ended
Dec. 31, 2020
Statement Line Items [Line Items]  
Disclosure of the available-for-sale movements [text block]
      December 31,       December 31,  
      2020       2019  
Equity securities, beginning of year   $
1,408
     $
1,742
  
Disposition of equity securities at fair value    
(3,950
 )    
-
  
Unrealized gain (loss) for the year    
14,493
      
(334
 )
Equity securities, end of year   $
11,951
     $
1,408