I think people over-react when they hear "black hole". The mass at the center of a black hole is simply extremely compact matter. This compact matter would have no more gravity than the object that created it (often times less due to the amount of mass of the original object lost in the creation of the compact mass). The thing that makes them dangerous is that it compacts the gravity well of that object also. And that is only dangerous if the object that created it had a lot of gravity.
So think about it this way. The troublesome black holes are made from
massive stars that fail under their own gravity. The matter in the star then plunges toward the center of the star crunching together and pounding the matter into a super-compact form.. often a lot of the rest of the material that isn't compacted is blown off (nova) or just becomes an additional part of the mass. This compact ball has a bit less gravity than the star that made it due to the loss of some material.
Now, the hugeness of the original star spreads its gravity well out over a large area and dissipates it a bit. The mass in the center of the black hole, on the other hand, is so much more compact that the gravity well is condensed into a smaller area.. because the "weight" is all in one spot the well is a lot deeper.
Think of it like a bed of nails. If you step on a single nail, that thing is going strait through your foot.. all of your weight is focused on that tiny little sharp point. However when you step on a bed of nails your weight is spread out over such a large area that you only sink a little bit. (i got tired of the balls on a bed sheet analogy
)
Ok... now keep all that in mind and consider a gold atom. A gold atom has jack shit for a gravity well.. You don't see gold atoms sucking in anything. Now smash two of them together and what do you get? Well.. apparently a bunch of possible results. BUT if somehow you created a super-compact ultra-tiny mass it would still only have the gravity of those two gold atoms. I HIGHLY doubt that that could do anything.
As for the black holes radiating and losing small amounts of energy over time i believe this mostly has to do with energy and the smaller particles being able to slowly, over time, escape the
event horizon of a black hole. I'm not sure if that applies to the central mass itself, but i could be wrong.
Seeing as how a micro-singularity wouldn't have the gravity to really to hold itself together, like a large one created by a star would, perhaps they would just fall apart and dissipate. They certainly wouldn't have enough mass to super-compact more material into itself and that is what would "grow" a small black hole like that. If by chance this thing could attract other matter it would just make a clump of regular matter.