Earlier in December 2018, it appeared that the Case Closed anime was scheduled to expire on Netflix on January 1, 2019.
On December 31, 2018, Netflix removed the expiration date from its listing for the Case Closed anime. This seems to indicate that the service has renewed the license to stream the series.
Case Closed is listed as “Season 1,” and includes the first 52 episodes of the series in its original Japanese language with English, Vietnamese, Arabic, and Polish subtitles.
Source: The Fandom Post