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Note 3 - Fair Value Measurements - Financial Assets Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Assets, fair value | $ 49,217 | $ 124,075
Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value | 11,493 | 67,089
Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value | 37,724 | 56,986
Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value |  |
Money Market Funds [Member] |  |
Assets, fair value | 11,493 | 67,089
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value | 11,493 | 67,089
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value |  |
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value |  |
Domestic Corporate Debt Securities [Member] |  |
Assets, fair value | 12,039 | 28,715
Domestic Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value |  |
Domestic Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value | 12,039 | 28,715
Domestic Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value |  |
Foreign Corporate Debt Securities [Member] |  |
Assets, fair value | 14,057 | 4,922
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 | 14,057 | 4,922
Foreign Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value |  |
United States Commercial Paper [Member] |  |
Assets, fair value | 8,635 | 7,770
United States Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value |  |
United States Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value | 8,635 | 7,770
United States Commercial Paper [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value |  |
Foreign Commercial Paper [Member] |  |
Assets, fair value | 2,993 | 15,579
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 | 2,993 | 15,579
Foreign Commercial Paper [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value |  |

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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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