Note 7 - Income Taxes (Details) - Net Deferred Tax Assets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Federal, state and foreign loss carryforwards	$ 6,527	$ 6,852
Capitalized research and development	475	753
Deferred revenue	77	(76)
Federal and state tax credits	1,762	1,773
Other	563	346
Total deferred tax asset	9,404	9,648
Less valuation allowance	$ (9,404)	$ (9,648)