In many states you may request a debtor's examination. It is generally a closed court room where you are permitted to ask questions regarding his assets. There you may be able to get more information regarding his accounts. In California if a party does not appear for the debtor's examination, the court may issue a bench warrant.
You may also file a writ of execution in the court where you won. If you can get his account information, the sheriff will appear at the bank and drain his account. You may also be able to grnish his wages.
Also, many courts ahve workshops on how to enforce a small claims court judgment. You should think about attending one of those if it is offered.
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