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Note 10 - Capital Stock - Capital Stock Issued and Outstanding (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
shares
Capital stock issued and outstanding, shares (in shares) | shares 35,842,611
Capital stock issued and outstanding, amount | $ $ 138,189
Subordinate Voting Shares [Member]  
Capital stock issued and outstanding, shares (in shares) | shares 34,516,917
Capital stock issued and outstanding, amount | $ $ 138,041
Multiple Voting Shares [Member]  
Capital stock issued and outstanding, shares (in shares) | shares 1,325,694
Capital stock issued and outstanding, amount | $ $ 148