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Note 13 - Capital Stock (Tables)
12 Months Ended
Dec. 31, 2017
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, 2016    
37,322,767
     
399,401
     
1,325,694
     
373
     
38,648,461
     
399,774
 
Balance, December 31, 2017    
37,608,467
     
406,611
     
1,325,694
     
373
     
38,934,161
     
406,984