Net realized and unrealized gain (loss) from investments in marketable securities is summarized below (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net realized and unrealized gain (loss) from investments in marketable securities is summarized below
Net realized gain (loss) from sales of securities	$ 11,000	$ 3,000
Unrealized net gain in trading securities	116,000	106,000
Total net gain from investments in marketable securities	127,000	103,000
Gross realized gain in marketable securities	34,000	20,000
Gross realized loss in marketable securities	$ 23,000	$ 23,000