Note 5 - Property and Equipment (Details) - Property and Equipment (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 4,000	$ 4,083
Less: accumulated depreciation	(3,469)	(3,547)
Property and equipment, net	531	536
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment at cost	1,958	2,080
Tooling [Member]
Property, Plant and Equipment [Line Items]
Property and equipment at cost	770	769
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment at cost	98	115
Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Property and equipment at cost	539	521
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment at cost	578	589
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 57	$ 9