Note 6 - Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Property and equipment, at cost	$ 587	$ 520
Less: accumulated depreciation and amortization	(166)	(149)
Total property and equipment, net	421	371
Equipment [Member]
Property and equipment, at cost	24	24
Furniture and Fixtures [Member]
Property and equipment, at cost	153	153
Computer Equipment and Software [Member]
Property and equipment, at cost	231	170
Production Equipment [Member]
Property and equipment, at cost	105	105
Leasehold Improvements [Member]
Property and equipment, at cost	$ 74	$ 68