The RFQ should not have been sent out to other than small businesses if the intent is to set the order aside for small businesses.  Was clause 52.219-6, Notice of Total Small Business Set-Aside, also included in your solicitation?  If so, you have a total small business set-aside and you only evaluate quotes from small businesses.  Work with your legal counsel and small business professional to determine the course of action to take if there are ambiguities in your solicitation as to whether or not your solicitation is a set-aside.