Avitar, Inc. (AVTI)

[k_trader]

Monthly OTC Short Interest Report

Short Interest is the total number of shares of a security that have been sold short by customers and securities firms that have not been repurchased to settle short positions in the market. Short selling is the selling of a security that the seller does not own, or any sale that is completed by the delivery of a security borrowed by the seller. Short selling is a legitimate trading strategy. Short sellers assume the risk that they will be able to buy the stock at a more favorable price than the price at which they sold short.

Read this, explains it all:
http://www.otcmarkets.com/marketactivity/short_interest.jsp

In other words what we see reported to OTC markets are only short sales that have been repurchased to cover, and NOT the entire short volume that is reported daily by FINRA. Someone might short and hold on to that position for weeks.