INVESTMENTS (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Investments
Other than Temporary Impairment Loss		$ (1,200,000)
Adjusted Cost	3,670,000	3,670,000
Unrealized gains	83,000	83,000
Unrealized losses	(561,000)	0
Net unrealized (losses) gains	(478,000)	83,000
Tax Excluded from Net Unrealized Gains	0	0
Fair value of investment	3,192,000	3,753,000
Amount included in short-term investments	2,126,000	2,687,000
Auction-rate securities	1,066,000	1,066,000
Contractual maturities (at adjusted cost) of available-for-sale debt securities
Due within one year	0
Due in 1-5 years	0
Due in 5-10 years	0
Due after 10 years	983,000
Total	983,000
Minimum maturity period of short-term investments as company has the ability and intent to redeem them within the year (in days)	90 days
Corporate equity securities
Investments
Adjusted Cost	2,687,000	2,687,000
Fair value of investment	2,126,000	2,687,000
Auction-rate securities
Investments
Adjusted Cost	983,000	983,000
Fair value of investment	$ 1,066,000	$ 1,066,000