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Note 12 - 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, 2017    
37,608,467
     
406,611
     
1,325,694
     
373
     
38,934,161
     
406,984
 
Balance, December 31, 2018    
37,887,442
     
415,432
     
1,325,694
     
373
     
39,213,136
     
415,805