When an investor believes that a stock is going to go down they can short the stock (borrow shares they don't own from their broker and sell it with the requirement that they will replace it later). Someone that shorts a stock hopes to be able to replace the borrowed shares later by buying them in the market at a lower price than they borrow it at and giving them back to the broker they borrowed them from.

The amount of shares that shows up in the Short Report is the number of outstanding shares that have been borrowed by 'shorters'. The number of shorts goes up and down depending on the sentiment of investors.

'ZERO' outstanding shorts means that no one is currently willing to bet that the NOT share price is going to go down. It often means they think that the shares price is going to go up or that shorting isn't worth the risk (if the stock goes up you may end up having to replace the borrow shares with shares that cost more).

.... Been There