I'm guessing those have something to do with pitch control for in-flight refuling.
Yes, they are so small it must be for fine control or trimming.
One thing the industry learned with the B-58 hustler is when in the TFR flight mode thinks got really shaky, enough to make the pilots sick. The initial B1 mission was low altitude under the radar penetration. For this they needed a good TFR auto flight control system to keep it out of the ground and as part of that the canards were added to dampen out the structural sine wave that came when rapid pitch changes were made by flight controls responding to approaching terrain changes.
They are for when the place is flying low and fast:
http://en.wikipedia.org/wiki/Canard_(aeronautics)#Active_vibration_damping