4. INVESTMENTS IN MARKETABLE SECURITIES (Detail) - (Table 1) Marketable Securities Gains (Losses) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net realized (loss) gain from sales of securities	$ (12,000)	$ 36,000	$ 55,000	$ 115,000
Unrealized net gain (loss) in trading securities	57,000	(209,000)	87,000	(256,000)
Total net gain (loss) from investments in marketable securities	$ 45,000	$ (173,000)	$ 142,000	$ (141,000)