Ideas for Friends

So, I have a couple of friends who are in business for themselves.  As most people, they are struggling right now and their business isn't doing well. If I had an idea for their business that I thought would help them now and in the future would it be my obligation to share it with them?

My concern would be that they would take it as an insult.  I know I can be honest and it not affect our relationship severely but I'm worried that I will offend them by sharing something that may be obvious to them.  I don't want to come off as if I know more about their business than they do.

What do you think?

Ethics, Work StuffErik Timmons