Have you been paying attention to shares of Douglas Dynamics (PLOW) ? Shares have been on the move with the stock up 11.4% over the past month. The stock hit a new 52-week high of $32.41 in the previous session. Douglas Dynamics has gained 36.5% since the start of the year compared to the -8.2% move for the Zacks Auto-Tires-Trucks sector and the -4.2% return for the Zacks Automotive - Replacement Parts industry.What's Driving the Outperformance?The stock has an impressive record of positive earnings surpris ...