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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 |  |

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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 No definition available. + Details
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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 + Details
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