flat calling an all-in vs. reraising

[trojanrabbit]

This is something I've been thinking about a while. Here's the situation: a small stack goes all-in before you and it's somewhere between 10-25% of your stack. Assuming you're not folding, what are the factors (number of players behind you, their stack sizes, your actual hand, etc.) that will make you lean toward flat calling vs. reraising?

I find that I almost never flat call here and I'm wondering if that's right. What are others' thoughts?

Tysen