'Why does this Flow Document take up more space than it needs?

The height of the object is about 60 pixels, but the text is only about 12 pixels tall. I tried setting the Height="30" but then the text wasn't readable.

<RichTextBox IsReadOnly="True" Focusable="False" >
    <FlowDocument xml:space="preserve" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" >
        <Table>
            <TableRowGroup>
                <TableRow>
                    <TableCell BorderThickness="0" >
                        <Paragraph>
                            <Bold>
                                <Run Text="test"/>
                            </Bold>
                        </Paragraph>
                    </TableCell>
                </TableRow>
            </TableRowGroup>
        </Table>
    </FlowDocument>
</RichTextBox>


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