Stocks were mixed on Monday with small gains and small losses in the major index ETFs. DIA and QQQ edged higher, while IWM and MDY edged lower. Small-caps and mid-caps continue to show relative weakness. Note that QQQ hit a new high and SPY is challenging its May high, but IWM and MDY remain well below their June highs. These are the two to watch if the market turns down because the laggards on…