I see that you are protective of your idea which I completely understand.  However, you might want to consider what parts of it you could share with a larger group of people and what parts you could save until you've built a trustworthy core team.

It's important to keep your idea closely held, but also important to be able to share enough of it with others to help build interest.

In any event, I wish you all the best with your concept.  There's nothing more exciting than the prospect of changing the world.