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Note 10 - Capital Stock (Tables)
12 Months Ended
Dec. 31, 2016
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    
34,516,917
    $
138,041
     
1,325,694
    $
148
     
35,842,611
    $
138,189