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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

X

- 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

X

- Details

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- Details

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- Details

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- Details

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- Details

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