Welcome to the world of unlisted stocks. This is a fairly well known stock. You can buy a share and get an annual report from the company. Another resource is King of California, a book about their history.
This isn't that cheap of a stock, but the play here is their water rights. What type of info are you looking for? I presume you already have the annual. King of California details their water battle really well. I'm not sure how you value the water, I've seen some estimates as high as $3k an acre.