Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

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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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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.

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This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

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Aggregate temporary impairment loss.

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Increase in fair value of available for sale securities.

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Interest rates auction time.

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Period for which failed auction securities been in an unrealized loss position.

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Subsequent loss recovery.

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Long Term Investments (Details Textual) (USD $)	6 Months Ended
Long Term Investments (Details Textual) (USD $)	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Long-Term Investments (Textual) [Abstract]
Auction rate securities, Par Value	$ 11,025,000	$ 11,205,000
Fair value of Failed Auction Securities	9,635,000	9,585,000
Gross unrealized loss on Failed Auction Securities	1,402,000	1,628,000
Aggregate credit loss	304,000	308,000	243,000	610,000
Decreased aggregate credit loss on Failed Auction Securities	4,000
Failed Auction Securities [Member]
Long-Term Investments (Textual) [Abstract]
Auction rate securities, Par Value	9,100,000	9,100,000
Period for which Failed Auction Securities been in unrealized loss position	exceeds 12 months
Fair value of Failed Auction Securities	7,698,000	7,472,000
Increase in fair value	226,000
Gross unrealized loss on Failed Auction Securities	1,402,000	1,628,000
Aggregate credit loss	304,000
Aggregate temporary impairment loss	1,098,000
Decreased aggregate credit loss on Failed Auction Securities	4,000,000
Decrease in temporary impairment loss	$ 5,000,000
Maximum [Member] \| Failed Auction Securities [Member]
Long-Term Investments (Textual) [Abstract]
Interest rates auction time	28 days
Minimum [Member] \| Failed Auction Securities [Member]
Long-Term Investments (Textual) [Abstract]
Interest rates auction time	7 days