Value bet this river?

[PoBoy321]

I've been at the table with the villain in this hand for a while, he's basically an idiot, has reloaded a bunch of times and, like I said, is basically retarded. I wasn't sure whether or not to bet this river because a) if he was on a draw, it didn't hit, so I won't get any more money out of him, but b) if I bet this river, I thought it was doubtful that he'd call me without an ace, but of course, if he had called me down this far with a worse hand, he'd probably call a bet on the river.

So what are your thoughts?

Ultimate Bet No-Limit Hold'em, $.50 BB (10 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

MP1 ($16.20)
Hero ($76.90)
MP3 ($41.50)
CO ($23.90)
Button ($19.70)
SB ($56.95)
BB ($24.95)
UTG ($79.25)
UTG+1 ($23)
UTG+2 ($38.80)

Preflop: Hero is MP2 with K/images/graemlins/spade.gif, Q/images/graemlins/spade.gif.
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises to $2</font>, <font color="#666666">3 folds</font>, SB calls $1.75, <font color="#666666">1 fold</font>.

Flop: ($4.50) A/images/graemlins/diamond.gif, Q/images/graemlins/heart.gif, A/images/graemlins/heart.gif <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets $3.5</font>, SB calls $3.50.

Turn: ($11.50) 4/images/graemlins/diamond.gif <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets $8</font>, SB calls $8.

River: ($27.50) 3/images/graemlins/club.gif <font color="#0000FF">(3 players)</font>
SB checks, Hero ...

[TrailofTears]

Just check it through, IMO. Maybe it is lost value, and you have the read on villain, but I don't want to get pushed off my value bet by a crazy move or anything. For example, you don't want to bet full pot because it is a lot for him to call with a worse hand, but you don't want to bet a little which he might come over the top of, forcing you to fold.

-Trail