Go to each day and add up the short positions for that day and you will get a real view of what is happening. And yes it is accumulative. Remember, these are FAILS-TO-DELIVER! They do not show up on the short sale list!!!
I'm not sure you are figuring this short stuff out correctly. I knew a Nasdaq market maker after he retired and he filled me in on a lot of facts and goings on. He worked for CINN. First of all, every sell order is considered a short sale until the cusip number is cleared in about three market days after the sell takes place. That number tells the clearing house if the shares were borrowed or not. The clearing house then sends the info to Nasdaq or what ever exchange that stock trades on. That is because only your broker knows if your sell order is a sell or a short. The M&M's only see a sell order, not a short order. The reason is because the broker must legally borrow the needed short shares and then he puts them up as a normal sell order.
I'm not sure what that OTC short report is, but there are entities, including OTC that keep accurate short numbers on every stock, see links. There is currently 0 short interest in NECA.
Anyone figuring differently is just flat wrong. It is hard to short a penny stock. It costs at least $2 a share and up collateral for each share shorted. Not many people willing to part with that kind of risk money on a penny stock. Also, short interest is published every two weeks and not every month like it used to be.
Market makers them selves can naked short any stock that there are not enough available shares due to high demand but they must keep accurate records and cover those shares when buy volume subsides and they can start buying back shorted shares.
Again, there is no short interest in this stock.
