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Fair Value Measurements And Marketable Securities (Marketable Debt Securities) (Details) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Amortized Cost, Total	$ 40,610,000	$ 42,947,000
Gross Unrealized Gains, Total	576,000	568,000
Gross Unrealized Losses, Total	(12,000)	(78,000)
Marketable securities, at fair value	41,174,000	43,437,000
Other Than Available For Sale Municipal Bonds [Member]
Amortized Cost, Total	6,220,000	18,029,000
Gross Unrealized Gains, Total	191,000	568,000
Marketable securities, at fair value	6,411,000	18,597,000
Municipal Bonds- Available-For-Sale [Member]
Amortized Cost, Total	34,390,000	24,918,000
Gross Unrealized Gains, Total	385,000
Gross Unrealized Losses, Total	(12,000)	(78,000)
Marketable securities, at fair value	$ 34,763,000	$ 24,840,000

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Debt Securities Amortized Cost.

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Debt Securities Gross Unrealized Losses.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale which are intended to be held for less than one year or the normal operating cycle, whichever is longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 2

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562

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