A black hole with 10^11 Kg seems to have a temperature of about 1.2 * 10^12 K. Even though it would be small, it would be emitting crazy amounts of all sorts of photons.
It's a black hole, that's not going to be throwing off black body radiation like that. It would be just hawking radiation plus whatever effects from matter in its accretion disk. That would still amount to pumping out 35.6 GW of hawking radiation, but being small isn't something that would inhibit it releasing energy, it's the other way around. So in other words, tiny black holes give off gobs of energy whereas larger ones do not.
