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Note 3 - Fair Value Measurements - Financial Assets Measured on a Recurring Basis (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Total | $ 168,623 | $ 49,217
Foreign Commercial Paper [Member] |  |
Available-for-sale securities | 19,854 |
Domestic Corporate Debt Securities [Member] |  |
Available-for-sale securities | 17,520 | 12,039
United States Commercial Paper [Member] |  |
Available-for-sale securities | 39,863 | 8,635
Foreign Corporate Debt Securities [Member] |  |
Available-for-sale securities |  | 14,057
Foreign Commercial Paper [Member] |  |
Available-for-sale securities |  | 2,993
Fair Value, Inputs, Level 1 [Member] |  |
Total | 91,386 | 11,493
Fair Value, Inputs, Level 1 [Member] | Domestic Corporate Debt Securities [Member] |  |
Available-for-sale securities |  |
Fair Value, Inputs, Level 1 [Member] | United States Commercial Paper [Member] |  |
Available-for-sale securities |  |
Fair Value, Inputs, Level 1 [Member] | Foreign Corporate Debt Securities [Member] |  |
Available-for-sale securities |  |
Fair Value, Inputs, Level 1 [Member] | Foreign Commercial Paper [Member] |  |
Available-for-sale securities |  |
Fair Value, Inputs, Level 2 [Member] |  |
Total | 77,237 | 37,724
Fair Value, Inputs, Level 2 [Member] | Domestic Corporate Debt Securities [Member] |  |
Available-for-sale securities | 17,520 | 12,039
Fair Value, Inputs, Level 2 [Member] | United States Commercial Paper [Member] |  |
Available-for-sale securities | 39,863 | 8,635
Fair Value, Inputs, Level 2 [Member] | Foreign Corporate Debt Securities [Member] |  |
Available-for-sale securities |  | 14,057
Fair Value, Inputs, Level 2 [Member] | Foreign Commercial Paper [Member] |  |
Available-for-sale securities | 19,854 | 2,993
Fair Value, Inputs, Level 3 [Member] |  |
Total |  |
Fair Value, Inputs, Level 3 [Member] | Domestic Corporate Debt Securities [Member] |  |
Available-for-sale securities |  |
Fair Value, Inputs, Level 3 [Member] | United States Commercial Paper [Member] |  |
Available-for-sale securities |  |
Fair Value, Inputs, Level 3 [Member] | Foreign Corporate Debt Securities [Member] |  |
Available-for-sale securities |  |
Fair Value, Inputs, Level 3 [Member] | Foreign Commercial Paper [Member] |  |
Available-for-sale securities |  |
Money Market Funds [Member] |  |
Money market funds | 91,386 | 11,493
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Money market funds | 91,386 | 11,493
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Money market funds |  |
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Money market funds |  |

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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=66048111&loc=d3e19207-110258 + Details
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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=75030427&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=82897076&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=82896770&loc=d3e26610-111562 + Details
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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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