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Note 4 - Balance Sheet Details - Available-for-sale Securities (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Available-for-sale securities, amortized cost | $ 37,741,000 | $ 56,026,000
Available-for-sale securities, gross unrealized losses | (17,000) | (40,000)
Short-term investments | 37,724,000 | 55,986,000
Domestic Corporate Debt Securities [Member] |  |
Available-for-sale securities, amortized cost | 12,048,000 | 27,750,000
Available-for-sale securities, gross unrealized losses | (9,000) | (35,000)
Short-term investments | 12,039,000 | 27,715,000
Foreign Corporate Debt Securities [Member] |  |
Available-for-sale securities, amortized cost | 14,065,000 | 4,927,000
Available-for-sale securities, gross unrealized losses | (8,000) | (5,000)
Short-term investments | 14,057,000 | 4,922,000
United States Commercial Paper [Member] |  |
Available-for-sale securities, amortized cost | 8,635,000 | 7,770,000
Short-term investments | 8,635,000 | 7,770,000
Foreign Commercial Paper [Member] |  |
Available-for-sale securities, amortized cost | 2,993,000 | 15,579,000
Short-term investments | $ 2,993,000 | $ 15,579,000

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: 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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- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + 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=65884222&loc=d3e22054-111558 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 + Details
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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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