Is it possible to "Close" or "Lock" an ideation?

I have been unable to find a way to accomplish something using Ideations in the forums. 

In our community, we are looking to use Ideations as a Bug Reporting tool, and would like to have a list of Ideation applications visible. This would be an ideation for each software version, but ideally users would only be able to interact with the most recent Ideation, and the others would be locked. 

In short, is it possible to lock an ideation to where users can still browse previous Ideas, but not post new ones?