Basic market cap is share price times outstanding shares. With BIEL the market cap you will see on iHub or Yahoo is often a little out of date and they may not have kept up to date on the current share total.
At times, BIEL’s market cap is ridiculously low and you wonder why someone didn’t keep buying shares until they could put whomever they wanted on the Board of Directors to vote in their favorite candidates.
I think the easiest answer is there’s not a lot of liquidity and you have to actually get a relatively small number of big shareholders to fork them over.