Note 5 - Balance Sheet Details - Components of Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Property, plant and equipment, gross	$ 1,469	$ 1,467
Less accumulated depreciation and amortization	(1,225)	(1,181)
Property and equipment, net	244	286
Leasehold Improvements [Member]
Property, plant and equipment, gross	114	114
Furniture and Fixtures [Member]
Property, plant and equipment, gross	316	314
Machinery and Equipment [Member]
Property, plant and equipment, gross	$ 1,039	$ 1,039