Since PLSB hasn't been bid $1.00 or more for ten consecutive days since last Summert, it is possible that the company may receive a "Deficiency" notice which would be the first step in a NASDAQ Capital Markets dellisting process. Is so, they would be given several chances and time.to remedy the situation: for examole, a reverse split (say 1 for 2). or a stock buyback.
FYI: Actually PLSB trades as an OTCQB, which technically is not a pink sheet listing. Pinky's have virtually no reporting requirements.
The OTC system is comprised of three tiers: OTCQX, OTCQB and OTCPink
Many legitimate small development-stage companies start out trading under OTCQB. OTCQX has tighter reporting standards than OTCQB and PLSB would logically move up to that tier some day assuming mgmt. doesn't sell off the company first. Doubt they'll ever seek a NASDAQ listing -- very expensive.