Shortman.com.au says that there are only 150 000 shorts active on RVR. If you look at the daily data it seems like more shorts than that, but very few are being held overnight, mostly day traders by the look of it.
It would be nuts to hold many shorts in this stock, it's not liquid enough to cover in a hurry if necessary.
Cheers,
Tim.
RVR Price at posting:
19.5¢ Sentiment: Buy Disclosure: Held