This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References+ Details

CASH, CASH EQUIVALENTS AND INVESTMENTS (Details 9) (USD $)												12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Carry value	Dec. 31, 2012 Recurring	Dec. 31, 2011 Recurring	Dec. 31, 2012 Nonrecurring Equity securities Privately-held companies	Dec. 31, 2011 Nonrecurring Equity securities Privately-held companies	Dec. 31, 2012 Level 1 Recurring	Dec. 31, 2011 Level 1 Recurring	Dec. 31, 2012 Level 3	Dec. 31, 2012 Level 3 Recurring	Dec. 31, 2012 Minimum	Dec. 31, 2012 Maximum
CASH, CASH EQUIVALENTS AND INVESTMENTS
Maturity period of bank notes receivable												3 months	1 year
Combined fair value of the long term investments in available-for-sale securities	$ 31,000,000		$ 31,000,000							$ 31,000,000
Short-term investment				296,000	2,372,000			296,000	2,372,000
Long-term investments	62,443,000	19,226,000		31,000,000							31,000,000
Investment fair value						$ 31,400,000	$ 19,200,000