AK, tptk on flop, top two pairs on river

ok, the flop bet was too small. Should I be raising or calling this river? I called, thinking that a small bet risked a push that i didn't want to make a decision on, or a fold so no added value. Read that villain is playing a lot of hands but very rarely bets postflop (I just checked numbers to confirm - 50-9-1)

Prima Network No-Limit Hold'em, $0.10 BB (3 handed)

BB ($18.99)
Hero ($13.64)
SB ($11.57)

Preflop: Hero is Button with [Ad], [Kh].
Hero raises to $0.4, 1 fold, BB calls $0.30.

Flop: ($0.85) [9h], [8d], [Ks] (2 players)
BB checks, Hero bets $0.42, BB calls $0.42.

Turn: ($1.69) [6d] (2 players)
BB checks, Hero bets $1, BB calls $1.

River: ($3.69) [As] (2 players)
BB bets $1, Hero calls?

This is 10nl, you should be value-betting the hell out of TPTK. Make it 2/3 - full pot on every street. Villain's river bet is weak, which to me reaffirms my notion that top 2 is usually the nuts. I would raise and call if he pushes.