Note 3 - Property and Equipment, Net - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands |
Jun. 30, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Property, plant, and equipment, gross | $ 124 | $ 104 |
| Less: accumulated depreciation | (37) | (24) |
| Property and equipment, net | 87 | 80 |
| Office Equipment [Member] | ||
| Property, plant, and equipment, gross | 23 | 17 |
| Laboratory Equipment [Member] | ||
| Property, plant, and equipment, gross | 62 | 49 |
| Furniture and Fixtures [Member] | ||
| Property, plant, and equipment, gross | 2 | 2 |
| Automobiles [Member] | ||
| Property, plant, and equipment, gross | 24 | 23 |
| Leasehold Improvements [Member] | ||
| Property, plant, and equipment, gross | $ 13 | $ 13 |