Jquery Delete All Table Rows Except First

<table id="tblGrid" cellpadding="10px" cellspacing="0" border="1">
    <tbody>
        <tr style="background-color:black;color:white;font-size:18px;">
            <td> ID </td>
            <td> Name </td>
            <td> Location </td>
            <td> Department </td>
        </tr>
    </tbody>
    <tbody>
        <tr>
            <td>100</td>
            <td>soumalya</td>
            <td>kolkata</td>
            <td>Accountant</td>
        </tr>
    </tbody>
    <tbody>
        <tr>
            <td>101</td>
            <td>rahul</td>
            <td>dumdum</td>
            <td>Management</td>
        </tr>
    </tbody>
    <tbody>
        <tr>
            <td>102</td>
            <td>suman</td>
            <td>kulti</td>
            <td>Accountant</td>
        </tr>
    </tbody>
</table> <button id="btndel" onclick="removerow()">Remove row</button>

function removerow()
{
    $("#tblGrid").find("tr:gt(0)").remove();
}