Note 1 - Organization and Summary of Significant Accounting Policies (Details) - Property and Equipment - Components (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 5,049	$ 4,772
Accumulated depreciation	(3,980)	(3,627)
Property and equipment, net	1,069	1,145
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	4,268	3,989
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	192	194
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	281	281
Building [Member]
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, gross	$ 308	$ 308