Risk Assessments are an essential part of any business, not only because of their practical use, but they are required by law (in most countries). In the United States, you are not required to document anything if your business has less than 5 employees. Risk assessments must be conducted before employees go to work on current or new workplace processes and are made to recognize problems before they have a chance to do surface and do harm to people or the business.
More likely than not, you will already have some measures in place to protect you and your employees. But a risk assessment must be made to ensure those measures are enough.