Note 7 - Net Loss Per Common Share (Details Textual) |
3 Months Ended |
---|---|
Mar. 31, 2018
shares
| |
Share-based Payment Arrangement, Option [Member] | |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 3,300,000 |
Warrant [Member] | |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 6,700,000 |
Restricted Stock [Member] | |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 338,000 |