Note 3 - Fair Value of Financial Instruments (Details) - Summary of Fair Value of Financial Instruments (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Cash equivalents:
Cash Equivalents	$ 13,462	$ 9,803
Marketable investments:
Marketable Investments	62,595us-gaap_AvailableForSaleSecurities	71,343us-gaap_AvailableForSaleSecurities
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Money Market Funds [Member]
Cash equivalents:
Cash Equivalents	3,759	242
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Marketable investments:
Total assets at fair value	3,759	242
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Commercial Paper [Member]
Cash equivalents:
Cash Equivalents	3,150	1,800
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Marketable investments:
Marketable Investments	62,595	71,343
Total assets at fair value	65,745	73,143
Fair Value, Measurements, Recurring [Member] \| Money Market Funds [Member]
Cash equivalents:
Cash Equivalents	3,759	242
Fair Value, Measurements, Recurring [Member] \| Commercial Paper [Member]
Cash equivalents:
Cash Equivalents	3,150	1,800
Fair Value, Measurements, Recurring [Member]
Marketable investments:
Marketable Investments	62,595	71,343
Total assets at fair value	69,504	73,385
Money Market Funds [Member]
Cash equivalents:
Cash Equivalents	3,759	242
Commercial Paper [Member]
Cash equivalents:
Cash Equivalents	$ 3,150	$ 1,800

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

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- Definition

Fair value portion 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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

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