Note 2 - Supplemental Balance-sheet Information - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Property and equipment, gross	$ 2,561	$ 1,967
Less accumulated depreciation	(1,856)	(1,577)
Property and equipment, net	$ 705	390
Equipment [Member]
Estimated useful life (Year)	5 years
Property and equipment, gross	$ 105	102
Leasehold Improvements [Member]
Property and equipment, gross	$ 638	250
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	$ 16	16
Software and Software Development Costs [Member]
Estimated useful life (Year)	3 years
Property and equipment, gross	$ 1,802	$ 1,599

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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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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