Note 6 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property and equipment, at cost	$ 714	$ 520
Less: accumulated depreciation and amortization	(243)	(149)
Total property and equipment, net	471	371
Equipment [Member]
Property and equipment, at cost	24	24
Furniture and Fixtures [Member]
Property and equipment, at cost	157	153
Computer Equipment and Software [Member]
Property and equipment, at cost	354	170
Production Equipment [Member]
Property and equipment, at cost	105	105
Leasehold Improvements [Member]
Property and equipment, at cost	$ 74	$ 68