If I book flight #148 from Tampa to PBI arriving at 8:25 will I have enough time to catch the Silver Airways Flight #146 to Marsh Harbor that leaves at 9:25? Is an hour enough time for me to make that flight?

Yes, you will be fine.

Your good.

It is a fairly small airport with basically two terminals. Within the same terminal you can get from one end to the other in 5 min. If you need to go from one terminal to the other, it may br just a 5 min walk, but you will need to clear security screening again.

Yes you will have enough time if your initial flight isn't delayed.