Tokyo's Nikkei index inched down slightly on Tuesday, with investors in wait-and-see mode ahead of Golden Week spring holidays and the announcement of corporate earnings. The benchmark Nikkei 225 index ended down 0.06 percent or 12.03 points at 19,771.19, while the broader Topix index was up 0.13 percent or 1.90 points to 1,449.15. nf/kaf