Heads up from BB against fishy small blind

[asdf1234]

Party Poker 2/4 Hold 'Em (9 handed)
small blind is very fishy, cold calling with all kinds of junk

Preflop: Hero is BB with 7/images/graemlins/diamond.gif, 4/images/graemlins/diamond.gif.
UTG folds, UTG+1 folds, MP1 folds, MP2 folds, MP3 folds, CO folds, Button folds, SB completes, Hero checks.

Flop: (2 SB) 8/images/graemlins/diamond.gif, 7/images/graemlins/spade.gif, 6/images/graemlins/heart.gif <font color="blue">(2 players)</font>
SB bets, Hero calls.

Turn: (2 BB) 4/images/graemlins/club.gif <font color="blue">(2 players)</font>
SB bets, Hero calls.

River: (4 BB) Q/images/graemlins/diamond.gif <font color="blue">(2 players)</font>
SB bets, Hero calls.

Final Pot: 6 BB
<font color="#990066">Main Pot: 6 BB, between SB and Hero.</font>

Comments on all streets welcome, but my issue with the hand is that I feel I should have gotten a raise in there somewhere. Thanks in advance.

[balkii]

On the flop I'd either raise or fold.
If I didn't raise on the flop and I was still in, n the turn I would definitely raise.
If I didnt raise on the turn, I would raise the river.