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Business and Significant Accounting Policies - Changes in Marketable Securities (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accounting Policies [Abstract]
Gross cash proceeds	$ 83,000	$ 45,000	$ 556,000	$ 358,000
Cost	14,000	7,000	84,000	50,000
Gross gain on sale included in earnings during the period	(69,000)	(38,000)	(472,000)	(308,000)
Deferred taxes on gross gain on sale included in earnings		14,000		115,000
Reclassification adjustment to unrealized gain in other comprehensive income for net gains included in earnings	(69,000)	(24,000)	(472,000)	(193,000)
Gross unrealized holding (loss) gain arising during the period included in other comprehensive loss	(625,000)	(187,000)	(404,000)	(3,445,000)
Deferred taxes on unrealized holding gain (loss) included in other comprehensive loss		(61,000)		813,000
Net unrealized holding (loss) gain	(625,000)	(248,000)	(404,000)	(2,632,000)
Other comprehensive (loss) income from marketable equity Securities	$ (694,000)	$ (272,000)	$ (876,000)	$ (2,825,000)