If the table is on a dashboard most standard CSS will work. just drop this "row" at the top of your dashboard XML and will change all table fonts on the Dashboard.
<row depends="$alwaysHideCSSPanel$">
<panel>
<html>
<style>
table tbody tr td{
font-size:150% !important;
font-family: "Times New Roman", Times, serif;
font-style: italic;
font-weight: bold;
font-variant: small-caps;
}
</style>
</html>
</panel>
</row>
