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Business and Significant Accounting Policies - Summary Marketable Equity Securities (Details) (USD $) | Sep. 30, 2013 | Dec. 31, 2012
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Accounting Policies [Abstract] |  |
Marketable equity securities at fair value | $ 3,790 | $ 7,093
Cost | 1,301 | 851
Accumulated other comprehensive income for unrealized holding gains | 2,489 | 6,242
Deferred taxes on accumulated other comprehensive income for unrealized holding gains | 1,400 | 2,328
Accumulated other comprehensive income | $ 1,089 | $ 3,914

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