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Note 11 - Capital Stock (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Stock by Class [Table Text Block]
    Subordinate Voting Shares     Multiple Voting Shares     Total Common Shares  
    Number     Amount     Number     Amount     Number     Amount  
                                                 
Balance, December 31, 2018    
34,654,353
    $
148,559
     
1,325,694
    $
148
     
35,980,047
    $
148,707