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Note 5 - Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Cash equivalents		$ 6,393
Investments	$ 67,186	24,000
Fair Value, Inputs, Level 1 [Member]
Cash equivalents		5,893
Investments	63,686
Fair Value, Inputs, Level 2 [Member]
Cash equivalents		500
Investments	3,500
Fair Value, Inputs, Level 3 [Member]
Cash equivalents
Investments
Money Market Funds [Member]
Cash equivalents	7,083	5,893
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents	7,083	5,893
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Cash equivalents
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Cash equivalents
Certificates of Deposit [Member]
Cash equivalents		500
Investments	3,500	24,000
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		500
Investments	3,500	24,000
Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member]
Cash equivalents
Investments
US Treasury Securities [Member]
Investments	63,686
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Investments	63,686
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Investments
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
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.

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- Definition

Amount of investment in marketable security, classified as current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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://fasb.org/us-gaap/role/ref/legacyRef
-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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