  Although the diamagnetism is of the essence in the superconducting phenomena,
small enough topological (or unconventional) superconductors are paramagnetic.
By solving the quasiclassical Eilenberger equation and the Maxwell equation
self-consistently in two-dimensional disks, we theoretically study the response
of small superconductors to weak magnetic field. Because of the topologically
nontrivial character of the wave function, the unconventional superconductor
hosts the zero-energy surface Andreev bound states which always accompany the
odd-frequency Cooper pairs. The paramagnetic property of the odd-frequency
pairs explains the unusual Meissner effect at low temperature.
