I'm not sure about a small company, but a couple of years back we did an organization-wide values exercise at Engineers Without Borders Canada. As a highly distributed organization with chapters across the country and staff across Africa as well, having a stated set of values that resonated extremely well with me and many other members and staff was very useful. It's a great foundation to build upon especially as the organization continues to grow.

You can check them out here: http://wiki.ewb.ca/en/EWBs_Values_and_Beliefs