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Note 4 - Property and Equipment (Details) - Property and Equipment (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Property and equipment at cost $ 9,786 $ 9,840
Less: accumulated depreciation (8,162) (8,040)
Property and equipment, net 1,624 1,800
Equipment [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment at cost 5,888 5,963
Tooling [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment at cost 2,598 2,600
Furniture and Fixtures [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment at cost 132 132
Software and Software Development Costs [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment at cost 537 462
Leasehold Improvements [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment at cost 629 633
Construction in Progress [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment at cost $ 2 $ 50