There are at least two places in the QMC you can check:
- System, Setup, QlikView Servers, expand and click on yours, Documents
- Documents, User Documents, click on the document, Availability
In the Publisher task you can specify whether or not the document will be available for Small Devices.
Hope that helps.
Christian, I recently documented the solution to this issue in a blog article, if this is still something you're struggling with. If not, hopefully it can help someone else!