Note 7 - Income Taxes (Detail) - Net Deferred Tax Assets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Federal, state and foreign loss carryforwards	$ 6,852	$ 6,893
Capitalized research and development	753	1,312
Deferred revenue	(76)	(153)
Federal and state tax credits	1,773	2,135
Other	346	219
Total deferred tax asset	9,648	10,405
Less valuation allowance	$ (9,648)	$ (10,405)

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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- Definition

The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other provisions, reserves, allowances, and accruals not separately disclosed.

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences from tax deferred revenue or other income not separately disclosed.

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