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Note 5 - Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Cash equivalents		$ 69,102
Investments	$ 25,750	20,500
Fair Value, Inputs, Level 1 [Member]
Cash equivalents
Fair Value, Inputs, Level 2 [Member]
Cash equivalents		69,102
Fair Value, Inputs, Level 3 [Member]
Cash equivalents
Money Market Funds [Member]
Cash equivalents	5,324	68,352
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Cash equivalents	5,324	68,352
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Cash equivalents
Certificates of Deposit [Member]
Cash equivalents		750
Investments	25,750	20,500
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents
Investments
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]
Cash equivalents		750
Investments	25,750	20,500
Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member]
Cash equivalents
Investments

X

- 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

No definition available.

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- Definition

Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if 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=82887183&loc=d3e6676-107765

Reference 2: 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=82896770&loc=d3e26626-111562

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

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