Mike, please don't bother with a credit if there is an overpayment. You have enough to do as it is. If you can, you might try throwing a small, labelled surprise into the box and we'll be square. I'm easy that way.
Canada is doing away with the penny: Yeah !. In Italy, when a shopkeeper owes you a few pennies, he/she points to a bowl of wrapped candies by the cash register. It means take a few and let's call it a deal... very civilized, indeed. Those Italians are always eating something.
Thanks.
Sylvain