Data type for more than 2 decimal places

I'm uncertain what Type to use for a new column that will hold values with 4 decimal places.
The Wiki "Introduction to Fields" says type of decimal has only 2 decimal places, and type of integer has no decimal places.

I see types of numeric and float in the type choice list, but don't know which, if either, of these would be appropriate for storing values with 4 decimal places.
When I try those types, neither of them gives me a place to define the number of decimal places for the column.

Can anyone provide guidance for me?
Thanks!