400nl: Small overpair...what the heck do I do now?

[neff]

Took a shot at 2/4nl, normally play 1/2. I suppose this could apply to either level. What do I do with the small overpair. No reads on villian, effective stacks 400.

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $2/$4
6 players
Converter

Pre-flop: (6 players) Hero is Button with 9[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/heart.gif[/img]
2 folds, CO calls, <font color="#cc0000">Hero raises to $18</font>, SB folds, BB calls, CO folds.

Flop: 8[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/heart.gif[/img] ($42, 2 players)
BB checks, <font color="#cc0000">Hero bets $38</font>, BB calls.

Turn: 2[img]/images/graemlins/diamond.gif[/img] ($118, 2 players)
BB checks, Hero checks.

River: Q[img]/images/graemlins/diamond.gif[/img] ($118, 2 players)
<font color="#cc0000">BB bets $100</font>.