Nikkei slightly fell by 0.07 percent in early trading Monday. At 9:15 a.m., the 225-issue Nikkei Stock Average was down 7.12 points, or 0.07 percent, from Friday at 10,680.99. The broader Topix index of all First Section issues on the Tokyo Stock Exchange was up 1.85 points, or 0.21 percent, at 890. 36.