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Note 4 - Available-for-sale Securities (Details) | 12 Months Ended
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Dec. 31, 2015 USD ($)
Domestic Corporate Debt Securities [Member] |
Available-for-sale securities, amortized cost | $ 28,750,000
Available-for-sale Securities, Gross Unrealized Gain |
Net unrealized loss on short-term investments | $ (35,000)
Available-for-sale Securities, Current | 28,715,000
Foreign Corporate Debt Securities [Member] |
Available-for-sale securities, amortized cost | $ 4,927,000
Available-for-sale Securities, Gross Unrealized Gain |
Net unrealized loss on short-term investments | $ (5,000)
Available-for-sale Securities, Current | 4,922,000
United States Commercial Paper [Member] |
Available-for-sale securities, amortized cost | $ 7,770,000
Available-for-sale Securities, Gross Unrealized Gain |
Net unrealized loss on short-term investments |
Available-for-sale Securities, Current | $ 7,770,000
Foreign Commercial Paper [Member] |
Available-for-sale securities, amortized cost | $ 15,579,000
Available-for-sale Securities, Gross Unrealized Gain |
Net unrealized loss on short-term investments |
Available-for-sale Securities, Current | $ 15,579,000
Available-for-sale securities, amortized cost | $ 57,026,000
Available-for-sale Securities, Gross Unrealized Gain |
Net unrealized loss on short-term investments | $ (40,000)
Available-for-sale Securities, Current | $ 55,986,000

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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=51813488&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=49167202&loc=d3e26626-111562 + Details
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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as 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 (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + 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=27724398&loc=d3e27161-111563 + Details
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