Stock Chart - Formatted Tooltip And Prefixes or Suffixes Not Showing

Stock Chart - Formatted Tooltip And Prefixes or Suffixes Not Showing

I am using a stock chart to show trend data. On the backend I am getting
what the valueSuffix should be (or valuePrefix as the case may be). I am
also formatting the date display in the tooltip. Here is the important
part of the series declaration:
...
name: 'Wages',
tooltip: {
valuePrefix: '$',
valueDecimals: 0
},
...
Here is the tooltip formatter:
...
tooltip: {
formatter: function () {
var s = '<b>';
if (Highcharts.dateFormat('%b', this.x) == 'Jan') {
s = s + 'Q1';
}
if (Highcharts.dateFormat('%b', this.x) == 'Apr') {
s = s + 'Q2';
}
if (Highcharts.dateFormat('%b', this.x) == 'Jul') {
s = s + 'Q3';
}
if (Highcharts.dateFormat('%b', this.x) == 'Oct') {
s = s + 'Q4';
}
s = s + ' ' + Highcharts.dateFormat('%Y', this.x) + '</b>';
$.each(this.points, function (i, point) {
s += '<br/><span style="color: ' + point.series.color +
'">' + point.series.name + ':</span>' + point.y;
});
return s;
}
}
...
Example jsFiddle.
If you notice the prefix for the dollar sign is not showing on the Wage
series. I am not really sure what I am missing here.