Have you been paying attention to shares of Northwest Pipe Co. (NWPX) ? Shares have been on the move with the stock up 26.1% over the past month. The stock hit a new 52-week high of $55.43 in the previous session. Northwest Pipe Co. has gained 82.5% since the start of the year compared to the 20.4% move for the Zacks Industrial Products sector and the 49.9% return for the Zacks Metal Products - Procurement and Fabrication industry.What's Driving the Outperformance?The stock has an impressive record of posit ...