To list:
find -mindepth 1 -maxdepth 1 -type d -exec du -ks {} + | awk '$1 <= 9' | cut -f 2-
To remove:
find -mindepth 1 -maxdepth 1 -type d -exec du -ks {} + | awk '$1 <= 9' | cut -f 2- | xargs -d \\n rm -rf
mass-file-remover