This is annoying me, because I appear to have lost all the old posts on the subject. I saved everything from Artpapa when it closed and reposted them into TheDrawingForum that I ran with JD Hillbury. I was the designer and webmaster, so I MUST have all the data somewhere...

So, I've spent an hour looking for it, when it was probably quicker to rewrite it.
I'll keep it specific to your query - logo use, rather than product use (such as T-shirts).
First: TERMINATION
You could have a licence agreement that has a start and end date or a start date and no end date, but I really would NOT recommend that. Either way, you should be specific about what the licence entitles them to do with your art. So, in your case, "Logo on bags, stickers, and promotional use as a logo. Not for resale as an image".
You NEED that end date. Imagine they become the Amazon of the Goat Cheese world... Your image is now world-famous... for which you received £50, £500, or whatever. I'm reminded of the NIKE logo story.
If you put, say, a 5-year end date, they have to renew. You might or might not charge again at that time. I suggest you do. If the situation demands it, you can charge more - or decline renewal, which is your prerogative and bargaining chip.
I'll just add here that if you were licensing your image to place on a product for royalties, that product will probably decrease in sales over the years. Without an end date, you will not be able to easily offer that image to another company for the same use.
EXCLUSIVITY:
Exclusive use needs to be priced at a considerably higher price than non-exclusive. Non-exclusive means they can use your image for their logo, but you can continue to market it as a print AND you can licence others to use it
for different purposes- not as a logo (you could, but not ethically). Exclusive gives them world-wide rights to use your logo, and no other business will have ANY use of it.
PRICE:
That's not for me to recommend. If the business is small, I prefer to charge a nominal fee. That also makes charging a renewal fee more welcome to both parties. You could argue that you're saving them the cost of having a custom logo designed, but I don't think that's viable.
If it's any help, the last time I licenced an image, it was for the labels on dog food packaging in Japan. I charged £150, and that was through a New Zealand agency that also had licenced others of my images.
If it helps, you can download a copy of my LICENSING AGREEMENT here:
LICENSING-AGREEMENT-1
Alter it to suit your situation, but try to not alter the language, or you might harm its legal meaning.
This is the licence I use, but I make no claims, nor accept any responsibility, regarding its legal standing.
I hope that helps.