The ornamental design for a small computer, as shown and described.
1. Small computer
1.1 : Perspective
1.2 : Front
1.3 : Back
1.4 : Left
1.5 : Right
1.6 :Top
1.7 : Bottom
1.8 : Reference view
1.9 : Reference view 2
1.10: Reference view 3
The broken lines depict portions of small computer that form no part of the claimed design; reproduction 1.1 is a front perspective view of the small computer; reproduction 1.2 is a front view thereof; reproduction 1.3 is a back view thereof; reproduction 1.4 is a left view thereof; reproduction 1.5 is a right view thereof; reproduction 1.6 is a top view thereof; reproduction 1.7 is a bottom view thereof; reproduction 1.8 is a reference view showing the use state in which the claimed design has been put on the floor and its antenna folded at 90 degrees, and forms no part of the claimed design; reproduction 1.9 is a reference view showing the use state in which the claimed design has been put on a stand, and forms no part of the claimed design; reproduction 1.10 is a reference view showing the use state in which the claimed design has been attached to a wall, and forms no part of the claimed design; this is a design for a small computer, and the claimed design can be used as shown in the reference views.