Note 4 - Balance Sheet Detail (Details) - Property and Equipment (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plany and equipment, gross	$ 7,745	$ 7,786
Less: Accumulated depreciation	(6,284)	(6,424)
Property and equipment, net	1,461	1,362
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plany and equipment, gross	641	625
Equipment and Furniture [Member]
Property, Plant and Equipment [Line Items]
Property, plany and equipment, gross	2,964	3,285
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plany and equipment, gross	$ 4,140	$ 3,876