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Note 4 - Fair Value Measurements - Financial Assets Measured on a Recurring Basis (Details) $ in Thousands | Sep. 30, 2016 USD ($)
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Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value | $ 38,265 | [1]
Money Market Funds [Member] |  |
Assets, fair value | 38,265 |
Domestic Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value | 17,086 | [1]
Domestic Corporate Debt Securities [Member] |  |
Assets, fair value | 17,086 |
Foreign Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value |  |
Foreign Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value | 14,127 |
Foreign Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value |  |
Foreign Corporate Debt Securities [Member] |  |
Assets, fair value | 14,127 |
United States Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value | 11,612 | [1]
United States Commercial Paper [Member] |  |
Assets, fair value | 11,612 |
Foreign Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value |  |
Foreign Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value | 5,982 |
Foreign Commercial Paper [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value |  |
Foreign Commercial Paper [Member] |  |
Assets, fair value | 5,982 |
Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value | 38,265 | [1]
Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value | 48,807 | [1]
Assets, fair value | $ 87,072 |
[1] | There were no significant transfers between level 1 and level 2 investments during the nine months ended September 30, 2016.

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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- Details
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Period Type: |