Note 3 - Property and Equipment, Net - Components of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, plant and equipment, gross	$ 1,467	$ 1,816
Less accumulated depreciation and amortization	(1,181)	(1,370)
Property and equipment, net	286	446
Leasehold Improvements [Member]
Property, plant and equipment, gross	114	114
Furniture and Fixtures [Member]
Property, plant and equipment, gross	314	373
Machinery and Equipment [Member]
Property, plant and equipment, gross	$ 1,039	$ 1,329