Only sort of.

An explicit double negative, like mi na na nelci, is a positive.

This means that, if a sentence like mi na nelci is followed by na go'i, you're still saying mi na nelci

But a negative answer to a negative question, thus:

xu mi na nelci
na go'i

is still negative.

Similar to the confusion with na nei.

..no! ..nooooooooooooooooooo!

To give an always-positive answer, use ja'a. It's a simpler system than English, where you have to notice the form of the question when answering "yes" or "no".

na go'i is always negative.ja'a go'i is always positive.