I think it would be hard to put into perspective the size of any tornado unless we have the exact survey data. In which case it would be the smallest tornado ever surveyed. A lot of times with tornadoes, the tornadic winds extend beyond the condensation funnel which makes the damage path wider than what the tornado may appear. This isn't the case all the time, but some times.
So once again goes the saying that "big tornadoes aren't necessarily stronger". Smaller tornadoes may appear that way, but could in fact but satellite tornadoes to larger tornadoes or have an expanding wind field. So I think its honestly impossible to say. 10 yards is probably the narrowest I've seen surveyed around here. Usually is the "go to" for an EF-U type tornado or landspout.