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Note 3 - Balance Sheet Components - Property and Equipment (Details) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Computer Equipment [Member]    
Property and equipment $ 10,209,000 $ 9,188,000
Software and Software Development Costs [Member]    
Property and equipment 1,828,000 1,713,000
Furniture and Fixtures [Member]    
Property and equipment 963,000 907,000
Leasehold Improvements [Member]    
Property and equipment 1,123,000 1,126,000
Test Equipment [Member]    
Property and equipment 9,667,000 7,214,000
Construction in Progress [Member]    
Property and equipment 7,432,000 4,777,000
Property and equipment 31,222,000 24,925,000
Less: accumulated depreciation (15,146,000) (13,600,000)
Total $ 16,076,000 $ 11,325,000