Decorating with small detail requires a paper piping cone. This allows you to have a small tip for small details. It also doesn’t hold much, giving you more control.
Start with a piece of parchment cut into a right angle triangle like this:
With the right angle towards the top, bring the left corner up to meet the right angle corner.
Same with the other side, except it will end up on the back side:
All three corners should be together. At this point, adjust by sliding the corners up or down against each other to tighten the tip or that there is no hole.
When you have it where you like it, fold the corners down into the funnel to secure.
Fill, and fold down the top. Cut off the tip and you’re ready to use.