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Business and Significant Accounting Policies - Business - Summary of Marketable Securities (Details) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]    
Marketable equity securities at fair value $ 4,210,000 $ 3,973,000
Cost 1,905,000 1,954,000
Accumulated other comprehensive income for unrealized holding gains 2,305,000 2,019,000
Deferred taxes on accumulated other comprehensive income for unrealized holding gains (802,000) (688,000)
Valuation allowance on deferred taxes on unrealized holding losses included in other comprehensive loss (857,000) (871,000)
Accumulated other comprehensive income $ 646,000 $ 460,000