Note 11 - Net Loss Per Share - Schedule of Antidilutive Shares Excluded from Computation of Net Loss Per Share (Details) - shares |
3 Months Ended | |
|---|---|---|
Mar. 31, 2020 |
Mar. 31, 2019 |
|
| Employee and Non-employee Stock Options [Member] | ||
| Antidilutive Securities (in shares) | 1,181,309 | 674,045 |
| Warrant [Member] | ||
| Antidilutive Securities (in shares) | 255,000 | 807,563 |
| Deferred Share Units [Member] | ||
| Antidilutive Securities (in shares) | 21,183 | 21,183 |