It was nuts for them; i.e. it was very agreeable to them.
Fond; pleased. She's nuts upon her cull; she's pleased with her cully. The cove's nutting the blowen; the man is trying to please the girl.
to be nuts  on anything or person is to be pleased with or fond of it or him; a self-satisfied man is said to be nuts  on himself. Nutted , taken in by a man who professed to be nuts  on you.