If you own shares in a delisted company (which, of course, will not happen to ISX) then you own shares in an unlisted public company. You still have the right to dividends, and you could still sell your shares to another party, just not on disallowed. Your shares would not be worthless unless that company actually folds.
ISX will be trading again soon enough, IMHO.
ISX Price at posting:
$1.07 Sentiment: Buy Disclosure: Held