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Note 4 - Fair Value Measurements - Financial Assets Measured on a Recurring Basis (Details) $ in Thousands	Sep. 30, 2016 USD ($)
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

Name:	us-gaap_AssetsFairValueDisclosureRecurring
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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Balance Type:
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X

- Details

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Balance Type:
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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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