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Note 4 - Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Cash equivalents | $ 69,102 | $ 61,635
Investments | 20,500 | 27,751
Fair Value, Inputs, Level 1 [Member] |  |
Cash equivalents |  |
Investments |  |
Fair Value, Inputs, Level 2 [Member] |  |
Cash equivalents | 69,102 | 61,635
Investments |  | 27,751
Fair Value, Inputs, Level 3 [Member] |  |
Cash equivalents |  |
Investments |  |
Money Market Funds [Member] |  |
Cash equivalents | 68,352 | 61,385
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Cash equivalents |  |
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Cash equivalents | 68,352 | 61,385
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Cash equivalents |  |
Certificates of Deposit [Member] |  |
Cash equivalents | 750 | 250
Investments | 20,500 | 25,750
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 | 250
Investments | 20,500 | 25,750
Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Cash equivalents |  |
Investments |  |
Corporate Debt Securities [Member] |  |
Investments |  | 2,001
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Investments |  |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Investments |  | 2,001
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
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 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 + 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=28358313&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=66010992&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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