50NL: AA min-raised on flop

[Lego05]

What does that min-raise on flop mean? Should I be 3 betting it?

Villian is 51.61/6.45/.58 over 31 hands.

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) Hand History Converter Tool (http://poker-tools.flopturnriver.com/Hand-Converter.php) from FlopTurnRiver.com (http://www.flopturnriver.com) (Format: 2+2 Forums)

UTG ($29.50)
MP ($88.55)
Hero ($55.40)
Button ($110.05)
SB ($81.35)
BB ($29.50)

Preflop: Hero is CO with A/images/graemlins/club.gif, A/images/graemlins/diamond.gif.
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $2</font>, <font color="#666666">2 folds</font>, BB calls $1.50.

Flop: ($4.25) 8/images/graemlins/club.gif, K/images/graemlins/diamond.gif, 3/images/graemlins/heart.gif <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $3</font>, <font color="#CC3333">BB raises to $6</font>, Hero calls $3.

Turn: ($16.25) 7/images/graemlins/heart.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $6.5</font>, Hero calls $6.50.

River: ($29.25) J/images/graemlins/diamond.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $15 (All-In)</font>, Hero calls $15.

Final Pot: $59.25

[Lemniscate]

3-bet the flop to $17

[Machavelli]

I dont mind smooth calling the flop on such a dry board. you've got position and it does keep your hand more disguised. i think raising the turn could be nice. By that time he will have pretty much committed himself to the hand.