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Employee Stock Compensation Plans - Employee Stock - Grant Date Fair Value of Options (Details) (USD $) | Dec. 17, 2012 | May 05, 2010 | May 19, 2009
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Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Option – grant date price (Cdn$) | 1.49 | 2.40 | 1.55
Options granted | 165,000 | 2,065,000 | 519,000
Expected volatility | 0.68 | 0.56 | 0.56
Risk free interest rate | 0.007 | 0.022 | 0.019
Weighted average fair value | 0.84 | 1.19 | 0.65
Grant date fair value | $ 139,000 | $ 2,449,000 | $ 339,000

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