Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5

+ Details

- Definition

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 includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

+ References+ Details

Note 4 - Cash, Cash Equivalents and Short-Term Investments (Detail) - Cash, Cash Equivalents, And Short-Term Investments (USD $) In Thousands, unless otherwise specified							9 Months Ended					9 Months Ended								9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2012 US Treasury Bill Securities [Member] Amortized Cost [Member]	Sep. 30, 2011 US Treasury Bill Securities [Member] Amortized Cost [Member]	Sep. 30, 2012 US Treasury Bill Securities [Member] Gross Unrealized Gains [Member]	Sep. 30, 2011 US Treasury Bill Securities [Member] Gross Unrealized Gains [Member]	Sep. 30, 2012 US Treasury Bill Securities [Member] Estimated Fair Value [Member]	Sep. 30, 2011 US Treasury Bill Securities [Member] Estimated Fair Value [Member]	Sep. 30, 2011 Certificates of Deposit [Member] Amortized Cost [Member]	Sep. 30, 2011 Certificates of Deposit [Member] Gross Unrealized Gains [Member]	Sep. 30, 2011 Certificates of Deposit [Member] Estimated Fair Value [Member]	Sep. 30, 2012 Amortized Cost [Member] Cash [Member]	Sep. 30, 2011 Amortized Cost [Member] Cash [Member]	Sep. 30, 2012 Amortized Cost [Member] Money Market Funds [Member]	Sep. 30, 2011 Amortized Cost [Member] Money Market Funds [Member]	Sep. 30, 2012 Amortized Cost [Member]	Sep. 30, 2011 Amortized Cost [Member]	Sep. 30, 2012 Gross Unrealized Gains [Member]	Sep. 30, 2011 Gross Unrealized Gains [Member]	Sep. 30, 2012 Estimated Fair Value [Member] Cash [Member]	Sep. 30, 2011 Estimated Fair Value [Member] Cash [Member]	Sep. 30, 2012 Estimated Fair Value [Member] Money Market Funds [Member]	Sep. 30, 2011 Estimated Fair Value [Member] Money Market Funds [Member]	Sep. 30, 2012 Estimated Fair Value [Member]	Sep. 30, 2011 Estimated Fair Value [Member]
Amortized Cost	$ 7,081	$ 7,958	$ 3,184	$ 16,687										$ 4,045	$ 2,373	$ 3,036	$ 5,585	$ 7,081	$ 7,958
Estimated Fair Value	3,036	5,585																				4,045	2,373	3,036	5,585	7,081	7,958
Amortized Cost	15,068	15,141			15,068	10,183			15,071	10,189	4,958		4,960					15,068	15,141							15,071	15,149
Gross Unrealized Gains							3	6				2								3	8
Estimated Fair Value	$ 15,068	$ 15,141			$ 15,068	$ 10,183			$ 15,071	$ 10,189	$ 4,958		$ 4,960					$ 15,068	$ 15,141							$ 15,071	$ 15,149