At these stakes, I'd call and reraise his bet on the river to put him all in. There's a realistic chance that Villian is making a play sensing weakness in your betting pattern. (Bet the pot on the flop, then half the pot on an unusual turn.) If you reraise here, and he has air, he'll fold. Under that scenario you may be able to get an extra bet out of him on the river. (Where you're going to make a pot size bet or push if he leads).