Those stocks are really difficult.   You can get quick gains but sudden drastic downturns also on little volumne.   Plus being thinly traded it might be hard to get out of if you build too big a position.  Although, people have made large profits with these on long uptrends I stay away from them.  If one shows up on my radar and the story checks out I might throw a few $ at it but only if I think it has hit a bottom.