Note 2 - Supplemental Balance-sheet Information - Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Dec. 31, 2017
Property and equipment, gross	$ 2,075	$ 2,038
Less accumulated depreciation	(1,690)	(1,620)
Property and equipment, net	$ 385	418
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	378
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	$ 20	18
Software and Software Development Costs [Member]
Estimated useful life (Year)	3 years
Property and equipment, gross	$ 1,483	$ 1,448

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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