The decision on my civil case says dismissed. Not sure if it’s with or without prejudice. Can I refile the same case

You can file.  The other side will probably move to dismiss based on the prior dismissal and you will litigate whether the prior dismissal was with or without prejudice.  If there really is no discussion of why your case was dismissed, and only a paper which says dismissed (which would be very strange and unlikely), it ws probaly on procedural grounds and would be without prejudice.