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Note 4 - Balance Sheet Details - Available-for-sale Securities (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Available-for-sale securities, amortized cost | $ 27,806,000 | $ 37,741,000 |
Available-for-sale securities, gross unrealized losses | (10,000) | (17,000) | $ (40,000)
Available-for-sale securities, current | 27,796,000 | 37,724,000 |
Domestic Corporate Debt Securities [Member] |  |  |
Available-for-sale securities, amortized cost | 13,003,000 | 12,048,000 |
Available-for-sale securities, gross unrealized losses | (10,000) | (9,000) |
Available-for-sale securities, current | 12,993,000 | 12,039,000 |
United States Commercial Paper [Member] |  |  |
Available-for-sale securities, amortized cost | 4,929,000 | 8,635,000 |
Available-for-sale securities, gross unrealized losses |  |  |
Available-for-sale securities, current | 4,929,000 | 8,635,000 |
Foreign Corporate Debt Securities [Member] |  |  |
Available-for-sale securities, amortized cost |  | 14,065,000 |
Available-for-sale securities, gross unrealized losses |  | (8,000) |
Available-for-sale securities, current |  | 14,057,000 |
Foreign Commercial Paper [Member] |  |  |
Available-for-sale securities, amortized cost | 9,874,000 | 2,993,000 |
Available-for-sale securities, gross unrealized losses |  |  |
Available-for-sale securities, current | $ 9,874,000 | $ 2,993,000 |

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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=75030427&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=82896770&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=82897076&loc=d3e27161-111563 + Details
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