Safety Study of NHL With 90Y-hLL2 IgG

90Y-labeled hLL2 will be administered according to a schedule based upon whether or not a patient had prior high-dose chemotherapy with a marrow or stem cell transplant. Patients with both indolent and aggressive types of NHL will be enrolled at each dose level without segregation. However, at the conclusion of the trial, with the maximum tolerated dose (MTD) defined, a minimum number of 6 patients with indolent NHL, 6 patients with aggressive NHL, and 6 patients with \>25% bone marrow involvement will be studied at that dose level.