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Note 13 - Capital Stock (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
  

Shares Under Warrants

  

Weighted Average Exercise Price

  

Weighted Average Remaining Contractual Life (in years)

  

Aggregate Intrinsic Value of Vested Warrants

 
                 
Outstanding as of January 1, 2019  105,556  $9.95   6.5  $1,419,728 

Issued

  -             

Exercised

  -             

Expired

  -             
                 

Outstanding as of December 31, 2019

  105,556  $9.95   5.5  $1,170,616 
                 
Issued  -             
Exercised  -             
Expired  -             
                 

Outstanding as of December 31, 2020

  105,556  $9.95   4.5  $1,868,341