In Chicago notes and bibliography style, the usual standard is to use a full note for the first citation of each source, and short notes for any subsequent citations of the same source.
However, your institution’s guidelines may differ from the standard rule. In some fields, you’re required to use a full note every time, whereas in some other fields you can use short notes every time, as long as all sources are listed in your bibliography. If you’re not sure, check with your instructor.