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Long-Term Investments (Details Textual) (USD $)	3 Months Ended				3 Months Ended	12 Months Ended	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2013 Failed Auction Securities [Member]	Dec. 31, 2012 Failed Auction Securities [Member]	Mar. 31, 2013 Certificates of deposit [Member]	Dec. 31, 2012 Certificates of deposit [Member]
Long-Term Investments (Textual) [Abstract]
Auction rate securities, Par Value	$ 7,611,000	$ 7,845,000			$ 6,100,000	$ 6,100,000	$ 231,000	$ 465,000
Interest rates auction time					28 days
Period for which Failed Auction Securities been in unrealized loss position					exceeds 12 months
Certificates of deposit amount of maturity							234,000
Maturity period of certificates of deposit							Jan. 27, 2013
Minimum Period for which failed Auction Securities been in unrealized loss position	12 months
Fair value of Failed Auction Securities	6,554,000	6,736,000			5,031,000	4,979,000	231,000	465,000
Increase in fair value						52,000
Gross unrealized losses	1,069,000	1,121,000			1,069,000	1,121,000
Aggregate credit loss	316,000	317,000	305,000	308,000	316,000
Aggregate temporary impairment loss					753,000
Decreased aggregate credit (losses) gains on Failed Auction Securities					$ 1,000

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- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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