Note 5 - Property and Equipment (Details) - Property and Equipment (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 3,920	$ 4,083
Less: accumulated depreciation	(3,404)	(3,547)
Property and equipment, net	516	536
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment at cost	1,940	2,080
Tooling [Member]
Property, Plant and Equipment [Line Items]
Property and equipment at cost	769	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	537	521
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment at cost	576	589
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment at cost		$ 9