Note 6 - Warrants - Summary of Warrant Activity (Details) - $ / shares shares in Thousands |
12 Months Ended | |
---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
|
Outstanding, Number (in shares) | 6,689 | 7,603 |
Outstanding, Weighted average exercise price (in dollars per share) | $ 4.50 | $ 4.46 |
Exercised, Number (in shares) | (2,609) | (914) |
Exercised, Weighted average exercise price (in dollars per share) | $ 4.75 | $ 4.18 |
Outstanding, Number (in shares) | 4,080 | 6,689 |
Outstanding, Weighted average exercise price (in dollars per share) | $ 4.35 | $ 4.50 |