Corporations come and go. Some fail to grow fast enough and die. Others spread like giant blobs in bad science-fiction movies. But the company that makes Dr. Bronner’s Soap is different. Certainly, the $7 million business could expand. Corporations in Sweden, Saudi Arabia, Germany, and Japan have offered to import the all-natural, inexpensive soap known for its thick lather. Big chain stores have asked to sell it, using their private labels. But the answer is always no. The family behind Dr. Bronner’s wants to stay small and honor the message on its label, which includes words from many of the world’s great religions and philosophers.