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Business and Significant Accounting Policies - Business - Changes in Marketable Securities (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Accounting Policies [Abstract]    
Gross cash proceeds $ 350,000   
Cost 50,000   
Gross gain on sale included in earnings during the period 300,000   
Deferred taxes on gross gain on sale included in earnings (105,000)   
Valuation allowance on deferred taxes on gross gain on sale included in earnings 105,000   
Reclassification adjustment to unrealized gain in other comprehensive income for net gains included in earnings (300,000)   
Gross unrealized holding gain (loss) arising during the period included in other comprehensive loss 586,000 (1,410,000)
Deferred taxes on unrealized holding (loss) gain included in other comprehensive loss (204,000) 526,000
Valuation allowance on deferred taxes on unrealized holding losses included in other comprehensive loss 104,000   
Net unrealized holding (loss) gain 486,000 (884,000)
Other comprehensive income (loss) from marketable equity securities $ 186,000 $ (884,000)