Additional Marketable Securities.

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- Definition

Average estimated fair value.

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- Definition

Average unrealized loss.

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- Definition

Company portfolios related to average maturity term.

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- Definition

Contractual maturity term classified as non-current marketable securities.

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- Definition

Debt Instrument Credit Rating Minimum.

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- Definition

Investment policy limits the effective maturity term on individual securities.

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- Definition

Investment policy limits term average portfolio maturity.

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- Definition

Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) where cost exceeds fair value is not an other than temporary impairment. This item contains disclosure of the number of investment positions in the available-for-sale investments determined to be temporarily impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-1
-Paragraph 21
-Subparagraph b(3)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 17
-Subparagraph b(3)

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- Definition

Description of the credit rating indicative of likelihood of repayment of the debt instrument given by a credit rating agency (for example, Standard and Poor's, Moody's, Fitch).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 4

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Marketable Securities (Details Textuals 1) (USD $)			6 Months Ended
Marketable Securities (Details Textuals 1) (USD $)	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2011 Moody's, A3 Rating [Member]	Jun. 30, 2011 Standard & Poor's, A- Rating [Member]	Jun. 30, 2011 Moody's, AA1 Rating [Member]
Guarantor Obligations [Line Items]
Minimum credit rating by credit agency			A3	A-
Company's portfolio average credit quality as defined by Moody's					AA1
Additional Marketable Securities (Textuals) [Abstract]
Investment policy limit on the effective maturity term for individual securities	6 Years
Investment policy limit on the effective maturity term for average portfolio	3 Years
Company's portfolios average maturity term	3 Years
Securities in an unrealized loss position	40	110
Average estimated fair value	$ 2,500,000	$ 2,100,000
Average unrealized loss	$ 10,000	$ 27,000
Contractual maturity term classified as non-current marketable securities	greater than 12 months