Watch for spider mites when it's indoors. They like crotons a lot. If you see tiny little webs and/or some leaves start dropping, stick it under a warm shower head with as much force as the plant can take. I lay mine on its side so I can get the underside of the leaves washed off. Watch and if you see the web threads return, do it again. Try and keep it in as humid conditions as possible. There aren't natural predators indoors to control the mites and the mites love dry air. That's what I learned about overwintering a croton. Yours should be easy since it's small. Mine is now approaching 4' and in a big clay pot, so it's a chore to give a shower. I do keep the soil moist on mine all winter.
