The page-break-inside: avoid property should control this, but it looks like most browsers don't support that on tr or td elements. In my testing, Opera is the only one that honors this property, as used in the following test:
<!DOCTYPE html>
<title>Page Break Test</title>
<style>tr, td { page-break-inside: avoid }</style>
<table border=1>
<tr height=200><td>This is a test. This should be tall.<td>Another column.
<tr height=200><td>This is a test. This should be tall.<td>Another column.
<tr height=200><td>This is a test. This should be tall.<td>Another column.
<tr height=200><td>This is a test. This should be tall.<td>Another column.
<tr height=200><td>This is a test. This should be tall.<td>Another column.
<tr height=200><td>This is a test. This should be tall.<td>Another column.
<tr height=200><td>This is a test. This should be tall.<td>Another column.
<tr height=200><td>This is a test. This should be tall.<td>Another column.
<tr height=200><td>This is a test. This should be tall.<td>Another column.
<tr height=200><td>This is a test. This should be tall.<td>Another column.
<tr height=200><td>This is a test. This should be tall.<td>Another column.
<tr height=200><td>This is a test. This should be tall.<td>Another column.
<tr height=200><td>This is a test. This should be tall.<td>Another column.
<tr height=200><td>This is a test. This should be tall.<td>Another column.
<tr height=200><td>This is a test. This should be tall.<td>Another column.
<tr height=200><td>This is a test. This should be tall.<td>Another column.
</table>
If you can use Opera, this might be good enough. Another option would be to look into Prince for printing your reports, as it tends to have much better support for print stylesheet features than the browsers do (though I haven't tested this feature in particular).