Note 5 - Property and Equipment (Details) - Property and Equipment (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 4,041	$ 4,083
Property and equipment at cost	4,041	4,083
Less: accumulated depreciation	(3,499)	(3,547)
Property and equipment, net	542	536
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment at cost	1,957	2,080
Property and equipment at cost	1,957	2,080
Tooling [Member]
Property, Plant and Equipment [Line Items]
Property and equipment at cost	845	769
Property and equipment at cost	845	769
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment at cost	89	115
Property and equipment at cost	89	115
Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Property and equipment at cost	542	521
Property and equipment at cost	542	521
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment at cost	575	589
Property and equipment at cost	575	589
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment at cost	33	9
Property and equipment at cost	$ 33	$ 9