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Note 14 - Capital Stock (Details Textual) CAD / shares in Units, $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 01, 2015 USD ($) | Feb. 28, 2004 CAD | Dec. 31, 2016 CAD / shares $ / shares | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 $ / shares | Dec. 31, 2016 USD ($)
Stockholders' Equity Note, Spinoff Transaction | $ | $ (138,396) |  |  | $ (138,396) |  |
Common Stock, Dividends, Per Share, Declared | $ / shares |  |  | $ 0.10 | $ 0.14 | $ 0.40 |
Share Price | CAD / shares |  |  | $ 49.49 |  |  |
Contingent Liabiilty upon Sale of Control | $ |  |  |  |  |  | $ 132,562
First Payment [Member] | Chief Executive Officer [Member] |  |  |  |  |  |
Percentage Payment of Shares Outstanding |  | 5.00% |  |  |  |
Payment Formula Base Price | CAD |  | CAD 3.324 |  |  |  |
Second Payment [Member] | Subordinate Voting Shares Conversion Rate [Member] |  |  |  |  |  |
Payment Formula Base Price | CAD |  | CAD 6.472 |  |  |  |
Second Payment [Member] | Chief Executive Officer [Member] |  |  |  |  |  |
Percentage Payment of Shares Outstanding |  | 5.00% |  |  |  |
Conversion from Old FSV Shares to Colliers Shares [Member] |  |  |  |  |  |
Spin off Arrangement Stock Conversion Ratio | 1 |  |  |  |  |
Conversion from Old FSV Shares to First Service Shares [Member] |  |  |  |  |  |
Spin off Arrangement Stock Conversion Ratio | 1 |  |  |  |  |
Subordinate Voting Shares [Member] |  |  |  |  |  |
Number of Votes for Subordinate Voting Shares |  |  | 1 |  |  |
Percentage of Original Base Price Payment Value | 58.57% |  |  |  |  |
Multiple Voting Shares [Member] |  |  |  |  |  |
Number of Votes for Multiple Voting Shares |  |  | 20 |  |  |

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