Karl & Hannah Fordahl leaving Norway

I am looking for info on when my great-great grandparents left Norway and on which ship. There name are Karl Ludwig Larsen & Hannah Lovise Torgeirsdatter (Andershaug) Fordahl. I know they were married in Norway on December 28, 1902 and by August of 1904 they were in Minnesota, USA. So they would have probably left Norway sometime in 1903 or 1904. Any help would be much appreciated!