Note 7 - Income Taxes (Details) - Net Deferred Tax Assets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Federal, state and foreign loss carryforwards	$ 7,039	$ 6,527
Capitalized research and development	241	475
Deferred revenue	71us-gaap_DeferredTaxAssetsDeferredIncome	77us-gaap_DeferredTaxAssetsDeferredIncome
Federal and state tax credits	2,269	1,762
Other	503us-gaap_DeferredTaxAssetsOther	563us-gaap_DeferredTaxAssetsOther
Total deferred tax asset	10,123us-gaap_DeferredTaxAssetsGross	9,404us-gaap_DeferredTaxAssetsGross
Less valuation allowance	(10,123)	(9,404)
Net deferred tax asset	$ 0us-gaap_DeferredTaxAssetsNet	$ 0us-gaap_DeferredTaxAssetsNet

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