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Note 4 - Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  |  |  | Fair Value Measurements at Reporting Date Using
|  | December 31, 2016 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 68,352 |  |  | $ | - |  |  | $ | 68,352 |  |  | $ | - |
Bank certificates of deposit |  |  | 750 |  |  |  | - |  |  |  | 750 |  |  |  | - |
Total cash equivalents |  |  | 69,102 |  |  |  | - |  |  |  | 69,102 |  |  |  | - |
Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank certificates of deposit |  | $ | 20,500 |  |  | $ | - |  |  | $ | 20,500 |  |  | $ | - |
|  |  |  | Fair Value Measurements at Reporting Date Using
|  | December 31, 2015 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 61,385 |  |  | $ | - |  |  | $ | 61,385 |  |  | $ | - |
Bank certificates of deposit |  |  | 250 |  |  |  | - |  |  |  | 250 |  |  |  | - |
Total cash equivalents |  | $ | 61,635 |  |  | $ | - |  |  | $ | 61,635 |  |  | $ | - |
Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | 2,001 |  |  | $ | - |  |  | $ | 2,001 |  |  | $ | - |
Bank certificates of deposit |  |  | 25,750 |  |  |  | - |  |  |  | 25,750 |  |  |  | - |
Total investments |  | $ | 27,751 |  |  | $ | - |  |  | $ | 27,751 |  |  | $ | - |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + 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 (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: 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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