Value bet this river?

[SoBeDude]

The CO is the worst player at the table. He sees most flops, calls 2 cold way too much, and likes to bluff.

The button is unknown, but seems a bit bad/LAGy.

Party Poker 15/30 Hold'em (10 handed)

Preflop: Hero is UTG+1 with Q[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/heart.gif[/img].
UTG folds, <font color="CC3333">Hero raises</font>, UTG+2 folds, MP1 folds, MP2 folds, MP3 folds, CO calls, <font color="CC3333">Button 3-bets</font>, SB folds, BB folds, Hero calls, CO calls.

Flop: (10.66 SB) 8[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/club.gif[/img] <font color="blue">(3 players)</font>
Hero checks, <font color="CC3333">CO bets</font>, Button calls, <font color="CC3333">Hero raises</font>, CO calls, Button calls.

Turn: (8.33 BB) 6[img]/images/graemlins/spade.gif[/img] <font color="blue">(3 players)</font>
Hero checks, <font color="CC3333">CO bets</font>, Button folds, <font color="CC3333">Hero raises</font>, CO calls.

River: (12.33 BB) 3[img]/images/graemlins/diamond.gif[/img] <font color="blue">(2 players)</font>

Is there a value bet here?

(In the hand, I bet and he folded.)

Also, any comments on the double check-raise?

-Scott