What does 2 Chronicles 15:16 mean?

King Asa even removed his grandmother Maacah from her position as queen mother because she had made a disgusting idol for worship. Asa tore down her idol, smashed it up, and burned it in the Kidron Valley. 2 Chronicles 15:16 - Modern Text Bible

(Asa was so serious about getting rid of idol worship that he even confronted his own family, removing his grandmother from power and destroying her idol.)