Proof that every Principal ideal domain is Noetherian

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I would like to know if my logic is sound.

We know that in every principal ideal domain, every ideal is multiplicatively generated.

Thus, for $a \in R$ we have: $aR = ${$ra: r \in R$}

Thus every ideal has a limit on size, right? So eventually our ascending chain of ideals will have to be the same for some ideal eventually?

Is that correct? It seems a bit too easy