Help! Float images height exceeds posts height. Any way to fix it?

Hello!

I have set images to float:left and when there is a short post the image height exceeds the post height. Here is a screenshot.

Is there a way to display the border below the image even if there is not enough text in post?

Here is what I have in my CSS:

li.pis-li {
	border-bottom: 1px solid #777;
}
.pis-title {
	text-align: left;
	font-weight: bold;
	font-size: 140%;
	padding-top: 20px;
}
.pis-utility {
	text-align: right;
	font-size: 75%;
}
.pis-excerpt img {
	float: left;
	margin-right: 10px;
	max-height: 200px;
	width: auto;
}

Thank you!

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