BATTLE LAKE, Minn. — Homer Saetre smiles as he extends his arm to offer a cup of coffee he just poured. “Is black OK?” he asks. The coffee goes down smoothly, its rich aroma mixing with the smell of fresh-cut grass outside the window. It’s a beautiful late spring day in Battle Lake, Minnesota, as Homer, 96, sits down in a high-backed pink armchair to hold court. But unlike it was for the 22 years he served as a Minnesota District Court J…