The basic reason that PSID remains low...
is simply because like many small companies the share price has been "diluted". In other words, the company has sold large quantities of shares to support R&D of product. It will take a strong revenue stream to eliminate such dilution.
However, in conjunction with Boeing, if they were awarded the large Biowatch contract or part, such dilution would become immediately non relative, or wiped clean... thus making share price escalate very quickly... perhaps jumping several dollars at opening bell..
hope this helps..