I have lots of evidence to prove so.
Firstly, Tohru's father isn't coming back for Tohru anytime soon: http://i.imgur.com/2XhvtkA.png
Tohru is too powerful to be forcefully brought back to her own world, and thus, her father decides to accept her choice to stay.
Secondly, we seen a new dragon at the end of the 12th episode, which we thought is Tohru's father...
Think again: https://i.imgur.com/gqNswmP.png
New dragon, this is what she looks like: https://i.imgur.com/Jsgf97v.png
This is why they are ending the first season early: a new dragon is arriving, which means there will be a new intro to the show entirely.
She's also the new dragon resident as it says here: http://i.imgur.com/MzHhjaI.png
So no, this isn't the end of the show, but...
Its only the beginning.