MARKETABLE SECURITIES AND FAIR VALUE MEASUREMENTS (Detail Textuals) (USD $)	1 Months Ended	12 Months Ended
	Jul. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Marketable Securities and Fair Value Measurements [Abstract]
Maximum short term interest reset period for auction rate securities		90 days
Minimum period for contractual maturities		10 years
Reset period frequency		Seven to twenty-eight days
Face value on auction rate securities		$ 2,100,000	$ 2,100,000		$ 59,500,000
Auction rate securities included in marketable securities long term		1,789,000	1,676,000
Net increase (loss) in value of auction rate securities		113,000	20,000
Redemption of auction rate securities from the exercise of put option	22,900,000			56,900,000
Retirement of notes payable				$ 44,400,000