I live in Detroit and use DTW as my primary airport.
In my opinion, the odds are good that you will make this connection. Why? Both flights should be in the McNamara terminal[1][2]. This assumes your first flight is on-time, and you hurry to the connecting flight.
I would call Delta to ask for seats near the front of the aircraft to help you deplane quickly, to aid this connection.
While other answers mention that McNamara Terminal is fairly large, it really is fairly quick to get around. Normally the trans-oceanic flights are near the middle, so probably won't need to go end-to-end.
[1] OP say flight with Delta from Miami to Delta; this should land in McNamara Terminal.
[2] The flight from DTW to AMS is probably with Delta or KLM; both of these depart from McNamara as well.