am i crazy thinking fold here? 1/2

[mother_brain]

villian has 133 i cover

villisn minraises, i make it 15 in CO with K [img]/images/graemlins/club.gif[/img] 10 [img]/images/graemlins/club.gif[/img], he calls.

Flop $31
A [img]/images/graemlins/club.gif[/img] Q [img]/images/graemlins/diamond.gif[/img] 5 [img]/images/graemlins/club.gif[/img]

he check calls $22

Turn $75
A [img]/images/graemlins/spade.gif[/img]
He check calls $75

River 225
K [img]/images/graemlins/spade.gif[/img]
he insta shoves his last $21 in

i think its small enough to call but what if it was like $35-50 or something, or maybe it is a fold, i dont know.