Japan's Nikkei gives up gains on caution for Micron earnings

By Junko FujitaJapan's Nikkei share average surrendered early gains to trade slightly lower on Monday, weighed down by declines in Nasdaq futures ahead of earnings for US memory chipmaker Micron Technology later in the week.The Nikkei TVC:NI225 ended the morning session 0.05% lower at 66,333.53, af…