None of these trading houses can short $CGRA so i am not sure where these Short theories are coming from...
But please call for yourself:
Etrade, Suretrader, Lightspeed, TD Ameritrade, OptionsXPress, Tradestation and Scottrade..
Please do your own DD
P.S. If you find a trader willing to short $CGRA, please post here to back up your theory