See the WI stop and ID statute which has already been posted and linked.
968.24 Temporary questioning without arrest. After having identified himself or herself as a law enforcement officer, a law enforcement officer may stop a person in a public place for a reasonable period of time when the officer reasonably suspects that such person is committing, is about to commit or has committed a crime, and may demand the name and address of the person and an explanation of the person’s conduct. Such detention and temporary questioning shall be conducted in the vicinity where the person was stopped.
2. Please state the basis the officers had for suspecting that such crime had been committed or was about to be committed.
I read it. The situation, as described, does NOT rise to the above level. Simply because someone calls 911 does NOT give law enforcement carte blanche to go in and violate citizens civil rights.