Yes, if you have a contract, you can sue to enforce its terms if you believe that they are violating it. To win, you would have to prove in court that they did in fact make a profit last quarter (and its amount/extent). That will require being able to see their P&L, etc. statements. That in turn will require being able to subpoeana them or get them through some other form of "discovery" (the legal mechanism of getting information and documentaton from the other side in a lawsuit). Check your state's small claims court rules--in many states (like mine: NJ), there is no discovery--no ability to get information or documents from the other side) in small claims court and so you could not effectively bring the action in small claims court. If there is no discovery in your small claims court, you may need to bring the lawsuit in regular county court, so as to have access to discovery, because if you can't get the documents, etc. in small claims court, you can't win--you can't prove the existence or extent of a profit. (And that then raises the issue of whether it would be economically worth suing if you could not do it in small claims court.)