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Note 2 - Cash and Cash Equivalents and Short-term Investments (Detail) - Summary of short-term investments: (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair Value	$ 53,454	$ 44,855
Gross Unrealized Gains (pre-tax)	1,471	1,000
Gross Unrealized Losses (pre-tax)	62	15
Mutual Funds [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value	31,779	24,851
Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value	31,779	24,851
Mutual Funds [Member]
Gross Unrealized Gains (pre-tax)	487	383
Municipal Bond Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value	21,675	20,004
Municipal Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value	21,675	20,004
Municipal Bond Securities [Member]
Gross Unrealized Gains (pre-tax)	984	617
Gross Unrealized Losses (pre-tax)	62	15
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value	53,454	44,855
Fair Value, Inputs, Level 1 [Member]
Fair Value	31,779	24,851
Fair Value, Inputs, Level 2 [Member]
Fair Value	$ 21,675	$ 20,004

X

- Definition

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

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 22

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13, 19

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLosses1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

+ References

Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph g

-Article 7

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant