I am trying to model an axe with NURBS so i created a curve for the axe-head. I ended the cuve close to the first point and then had maya automatically close the curve, Since i want the cutting edge of the axe to come to a sharp point i will have to bend the curve a bit so i cannot create a planar surface. I was going to create a boundary surface by cutting the curve i made for the axe head into 4 seperate curves (top, bottom, 2 sides).

I set the four points where i want maya to cut the curves, but when i go to Surfaves > Detach Curves, this is my result

i looked in the outliner and it did in fact make four curves, however the fourth curve is extremely small.

ive tried numerous different things and i keep running into the same problem with detach curves. It seems to always delete a portion of my curve! Im totally stumped and would really appreciate any help or ideas on what my problem could be. I apologize if it is something blatantly obvious!
thanks for you time,
-matthew