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Note 13 - Capital Stock (Details Textual) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2004 CAD / shares | Dec. 31, 2017 CAD / shares $ / shares | Dec. 31, 2016 $ / shares | Dec. 31, 2017 USD ($)
Common Stock, Dividends, Per Share, Declared | $ / shares |  | $ 0.10 | $ 0.10 |
Share Price |  | $ 75.87 |  |
Contingent Liabiilty upon Sale of Control | $ |  |  |  | $ 230,185
Subordinate Voting Shares Conversion Rate [Member] |  |  |  |
Payment Formula Base Price, Second Payment | CAD 6.472 |  |  |
Chief Executive Officer [Member] |  |  |  |
Percentage Payment of Shares Outstanding, First Payment | 5.00% |  |  |
Payment Formula Base Price, First Payment | CAD 3.324 |  |  |
Percentage Payment of Shares Outstanding, Second Payment | 5.00% |  |  |
Subordinate Voting Shares [Member] |  |  |  |
Number of Votes for Subordinate Voting Shares |  | 1 |  |
Multiple Voting Shares [Member] |  |  |  |
Number of Votes for Multiple Voting Shares |  | 20 |  |

X
- Definition Contingent liability upon arm's length sale of control of the Company. + References No definition available. + Details
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- Definition Represents the information pertaining to the payment formula base price for the second payment. + References No definition available. + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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