Ooofff, I don't know. The two years we lived in Belgium, our taxes were highly complicated with me being paid in German DM and my husband in Belgium but with USD. We hired an accountant for those two years.
My gut feeling is that for small amounts, you wouldn't need to worry about it, because it wouldn't change the status (tax bracket). You should still declare it of course, and the publisher will send you a form that you'd need to fill out and they will send to the IRS.
I hope others living outside the US will be able to guide you better.
Good luck, Vijaya