Sold my Maine home while living in Michigan. I have no other income for Maine in 2015. Maine withheld 2.5% revenue tax at the time of sale. How do I go about filing this?

My home in Maine was previously my primary home and has been used for no other purpose. At the time of the sale, I was a resident of Michigan. The house was not sold at a loss, but the profit margin was small. Maine withheld 2.5% at the time of sale. I do not know how/where to file the withheld amount or if I even need to file a Maine return at all. I do not want to be charged additional Maine tax in error if I do not make it clear that the amount was already withheld for me. Please help.