Simple TPTK on the river question $25 6max

[Sponger15SB]

Should I just keep betting? How much? Guy is 37/0 after 23 hands so that doesn't mean *that* much so just assume your avg idiot?

Villian limps, we've both got $25, I raise to $1 with A [img]/images/graemlins/heart.gif[/img]K [img]/images/graemlins/diamond.gif[/img], he calls and we're HU

on a flop of A[img]/images/graemlins/spade.gif[/img]3[img]/images/graemlins/heart.gif[/img]7[img]/images/graemlins/spade.gif[/img]
He checks, I bet $2, he calls.

Turn is J[img]/images/graemlins/heart.gif[/img]
He checks, I bet $5, he calls.

River is a 4[img]/images/graemlins/club.gif[/img]
He checks and I check or bet how much?