It was not hard at all to short it on the BB (at least for the MM's). Typically 30 to 50% of the daily trading volume for NNVC there consisted of short transactions. But the accumulated short interest there was very low, meaning it was primarily day trading with little held short overnight.
Typical accumulated short interest in the stock would be something around 10%. Could go much higher but I think that is a reasonable target once it has been trading on the new exchange for awhile.