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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