Thank you, oksewglad! It was done with the embroidery machine. It's a little cumbersome re-hooping for every square, but the 20 squares took about 4 1/2 hours to do. It could take a lot less time (and a lot less thread!) if I'd picked a single run pattern rather than these bean stitches, but I figured for such a small project, it might be worth trying.
Congrats on your August finish, too! If I had a longarm, things would definitely stay on it until the muse sings to me, which could easily take months.