SiNguyen

Dave, how about Juniperus rigida? Since you bought it from a bonsai dealer, it could very well be this type of needle juniper. Very commonly used in Japan but is not commonly found in this country. Try Google it for the description of the foliage and fruits on female trees. I think the needles tend to be paler on the top surface and has a thin center pale stripe. J. chinensis San Jose and Foemina are also thought of as "needle" junipers too?, but they do have more mature type scale foliage like you said, although that could take many years to develop, or not at all if you keep pruning it . San Jose junipers also have a rough bark too. Yours appears fairly smooth right?
Good luck!
Si