min betting on flop and turn

[awarunn]

1/2 NL 6-handed
Villian's stats are pretty solid besides a high win$ at showdown %
Villian ($567.12) is SB
Hero ($442.90) is CO
hole cards:
Q [img]/images/graemlins/diamond.gif[/img] K [img]/images/graemlins/diamond.gif[/img]

folded to Hero
Hero raises to $8
Button folds
Villian calls $7
BB folds

Flop: 3 [img]/images/graemlins/heart.gif[/img] T [img]/images/graemlins/heart.gif[/img] 2 [img]/images/graemlins/heart.gif[/img] [$10]
Villian bets $2
Hero calls $2

Turn: J [img]/images/graemlins/club.gif[/img] [$14]
Villian bets $2
Hero calls $2

River: 9 [img]/images/graemlins/spade.gif[/img] [$18]
Villian bets $20
Hero calls $20

Final Pot: [$64]

Is calling here correct or weak?