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How good is it for SEO if you have a widget that lives on other sites?

On my website I offer an option to let users embed information from my site with some kind of "homepage widget". If a user wants to embed it in his website, he basically has to add one line of Javascript to his HTML files like this:

<script src="http://mysite.com/myscript.php?some_options_here"></script>

Inside the widget, I export some content from my website and of course create a link back to my website. This is done in Javascript with document.write.

document.writeln("My great exported content");
document.writeln('<a href="http://mysite.com?ref=widget>Check mysite.com</a>');

I have Google Analytics set up to track whether the links in there get clicked, and they do.

Now I am asking myself if Google recognizes these links as valid backlinks from the embedding domain. I know that Googlebot can parse and execute Javascript, but I have not found any references whether these links also count as "normal" backlinks.