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Short -Term Investments (Details 4) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Investments in continuous unrealized loss position for twelve months or more
Fair Value	$ 2,004,000	$ 5,172,000
Unrealized Losses	(400)	(68,000)
Corporate bonds and notes [Member]
Investments in continuous unrealized loss position for twelve months or more
Fair Value	2,004,000	5,172,000
Unrealized Losses	$ (400)	$ (68,000)

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer.

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