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Business and Significant Accounting Policies - Business Changes in Marketable Securities (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Accounting Policies [Abstract]        
Gross cash proceeds $ 123,000 $ 313,000 $ 473,000 $ 313,000
Cost 20,000 43,000 70,000 43,000
Gross gain on sale included in earnings during the period 103,000 270,000 403,000 270,000
Deferred taxes on gross gain on sale included in earnings (35,000) (101,000) (140,000) (101,000)
Valuation allowance on deferred taxes on gross gain on sale included in earnings 35,000    140,000   
Reclassification adjustment to unrealized gain in other comprehensive income for net gains included in earnings (103,000) (169,000) (403,000) (169,000)
Gross unrealized holding (loss) gain arising during the period included in other comprehensive loss (365,000) (1,848,000) 221,000 (3,258,000)
Deferred taxes on unrealized holding gain (loss) included in other comprehensive loss 128,000 348,000 (76,000) 874,000
Valuation allowance on deferred taxes on unrealized holding losses included in other comprehensive loss (28,000)    76,000   
Net unrealized holding (loss) gain (265,000) (1,500,000) 221,000 (2,384,000)
Other comprehensive (loss) income from marketable equity securities $ (368,000) $ (1,669,000) $ (182,000) $ (2,553,000)