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Note 2 - Supplemental Balance-sheet Information - Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Property and equipment, gross $ 2,038 $ 1,826
Less accumulated depreciation (1,620) (1,282)
Property and equipment, net $ 418 544
Vehicles [Member]    
Estimated useful life (Year) 5 years  
Property and equipment, gross $ 32 32
Equipment [Member]    
Estimated useful life (Year) 5 years  
Property and equipment, gross $ 162 162
Leasehold Improvements [Member]    
Property and equipment, gross $ 378 292
Leasehold Improvements [Member] | Minimum [Member]    
Estimated useful life (Year) 2 years  
Leasehold Improvements [Member] | Maximum [Member]    
Estimated useful life (Year) 5 years  
Furniture and Fixtures [Member]    
Estimated useful life (Year) 7 years  
Property and equipment, gross $ 18 16
Software and Software Development Costs [Member]    
Estimated useful life (Year) 3 years  
Property and equipment, gross $ 1,448 $ 1,324