You can't put the cat back in the bag. There are some variations on this basic definition depending on your state. Some definitions require that you use your trade secret continuously in your business or risk losing your legal protections. In deciding whether information is a trade secret, courts look at many factors. Don't underestimate the value of your information nor the legal protection available to you.
Trade secrets are quite different than other types of intellectual property.
Unlike with copyrights and patents, your information need not be novel, creative, original nor tangible to be entitled to protection. When in doubt, consult with your lawyer. Surprisingly, you can post information on a Web site and still retain trade secret status. What it does require is some common sense security procedures. The law recognizes that a trade secret that is absolutely secret is useless.