In order to determine the exact value of any given basketball card, your best bet is to take the card to a specialty collectable store and ask for an appraisal. For a quick approximation, you can always check an online auction site like eBay (http://www.ebay.com) to see what cards like yours are selling for now. Remember that condition plays a big role in determining the value of any collectable.
The value of a Michael Jordan basketball card depends upon which card you have, as well as the condition of the card. You can have the card looked at by an expert in sports cards to get the value of the card.