Take a look at PhaseWare Tracker. We are working on a version specifically for very small, even one person business. Give us a call so we can talk about it.
http://www.phaseware.com
866-390-3492
I am with PhaseWare, Inc. We are currently offering a free trial of our SaaS offering of customer support software, plus we have the same software for on-premise with several very helpful addons.
http://www.phaseware.com/test-drive