Are basketball cards worth money?

I have a booklet of basketball cards I collected when I was a kid. They are in near mint condition and I have held onto them thinking one day they would be worth money. They are from '91-'93 and include the following players: Dennis Rodman (when he played with the Spurs), Alonzo Mourning, Dee Brown, Chris Robinson, BJ Armstrong, Charles Barkley, Shaq, Isiah Thomas, Karl Malone, Shawn Kemp, Dikembe Mutombo, Larry Johnson, Shawn Kemp, Patrick Ewing, Hakeem Olajuwon, David Robinson, Chris Webber & others. Are these worth any money? Will they ever be worth any money? Should I keep them?