Making a recursive CTE like query, but for many records

Question

I have a table with a hierarchy ( with a recursive parentID column), for one record, I know how to get the last parent record, with the following code :

declare @Id integer

;WITH CTE AS
(
    SELECT  a.[Id],
            a.[ParentId]
    FROM    [Area] a WITH (NOLOCK)
    where a.[Id] = @Id 

    UNION ALL

    SELECT  a.[Id],
            a.[ParentId]
    FROM [Area] a WITH (NOLOCK)
    INNER JOIN CTE cte ON cte.[ParentId] = a.[Id]
)

SELECT top 1 a.[Id]
FROM CTE a
WHERE a.ParentId is null

It works as long as I'm working with one id, here @Id.

But I can't find a way to do the same but for a list of Ids, without using cursors, as CTE seems to be OK only when y'oure working on one record.

Could someone point me at the right direction ?

Many thanks