NL50: 66 UTG. Thin value bet against calling station. Ok?

[AlexB182]

Villain is pretty loose and post flop pretty much a calling station, running 43/19/0.8 over about a 100 hands. His PF raises are minraises mostly though.
I'm running at 18/11 at this table.
Is this value bet on the river ok? The Q is a little scary but he did not show any strenght so far so I can't give him credit for that, right?
Comments very welcome...

Full Tilt Poker, $0.25/$0.50 NL Hold'em Cash Game, 8 Players
LeggoPoker Hand History Converter

SB: $70.85
BB: $67.95
Hero (UTG): $48.20
UTG+1: $57.05
MP1: $33.50
MP2: $51.35
CO: $94.25
BTN: $94.80

Pre-Flop: 6[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/spade.gif[/img] dealt to Hero (UTG)
Hero calls $0.50, 4 folds, BTN calls $0.50, SB folds, BB checks

Flop: ($1.75) Q[img]/images/graemlins/heart.gif[/img] 5[img]/images/graemlins/diamond.gif[/img] 2[img]/images/graemlins/spade.gif[/img] (3 Players)
BB checks, <font color="red">Hero bets $1.50</font>, BTN calls $1.50, BB folds

Turn: ($4.75) 7[img]/images/graemlins/diamond.gif[/img] (2 Players)
Hero checks, BTN checks

River: ($4.75) 4[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $3</font>