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Note 5 - Commitments and Contingencies (Details Textual) | 12 Months Ended
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Dec. 31, 2015 USD ($) ft² | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Redwood City [Member] |  |  |
Area of Real Estate Property | ft² | 26,067 |  |
Jersey City [Member] |  |  |
Area of Real Estate Property | ft² | 1,898 |  |
San Diego [Member] |  |  |
Area of Real Estate Property | ft² | 3,419 |  |
Operating Leases, Rent Expense | $ | $ 1,502,000 | $ 1,381,000 | $ 967,000
Purchase Obligation | $ | 3,851,000 |  |
Unrecorded Unconditional Purchase Obligation | $ | $ 3,192,000 |  |

X
- Definition Area of a real estate property. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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X
- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308 + Details
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- Details
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Data Type: | na
Balance Type: |
Period Type: |