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 required to document anything if your business has more than 5 employees. Risk assessments must be conducted before employees go to work on current or new work processes to ensure they recognize problems before they have a chance to surface and prevent people from harming themselves, others or the business.
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 both known and up-to-date.