2-pair on flush board

[profnabeshin]

Full Tilt No-Limit Hold'em, $0.02 BB (7 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

UTG ($2.78)
MP1 ($2.05)
MP2 ($3.66)
CO ($1.99)
Button ($2.01)
SB ($1.10)
Hero (BB) ($1.97)

Preflop: Hero is BB with Q, A
3 folds, CO bets $0.06, 1 fold, SB calls $0.05, Hero calls $0.04

Flop: ($0.18) 3, A, Q (3 players)
SB checks, Hero bets $0.14, CO calls $0.14, 1 fold

Turn: ($0.46) 7 (2 players)
Hero checks, CO checks

River: ($0.46) K (2 players)
Hero bets $0.24, CO raises to $0.71, Hero? I don't think that he has the flush.

Total pot: $1.88 | Rake: $0.12

Results:
Hero had Q, A (two pair, Aces and Queens).
CO had K, K (three of a kind, Kings).
Outcome: CO won $1.76

[Marm]

I'd call, he's a masterful slowplayer if he has the flush. If you lose, pay em and make a note of it.

EDIT: You played this perfectly, in as much as you priced him out of the flush draw on the flop. In hindsight, and arguement might be made for doing it again on the turn, but I might check there, too.