Turn and River Raises Indicate STRENGTH
When you get raised on the turn by most micro- and low-stakes players, it is almost always a strong hand. And if you get raised on the river... well, just assume it's the nuts. Remember that the vast majority of players at the small stakes tables are passive. They want to call and see cheap showdowns-- mainly because their hand ranges are so wide that they aren't normally very strong. So when they do raise, especially on later streets, it's unusual. In other words, they really like their hand. Most of these players are incapable of bluffing on the river, so you can usually discount it from their range.
Of course there are exceptions, such as LAgtards and maniacs raising and re-raising, but for the majority of players you face at the teeny tables, just assume that a later street raise is near the nuts. Make disciplined folds when facing a late street raise from a passive player-- and you'll save a lot of money in the long run.
All-in for now...