Analysts at Needham turned bullish on First Solar, Inc. FSLR for several key reasons. The firm's Y. Edwin Mok upgrades solar companyboasts a "robust" bookings activity that will cover most of its supply through 2020. Beyond the end of the decade, the company will likely see strong demand along with better pricing to support growth, the analyst wrote in the upgrade note. While sales will likely re-accelerate in mid-2018, so will the company's profit, which will support a solid top- and bottom-line growth in 2019 and beyond. Read moreSome upside still holds. $FSLR, First Solar, Inc. / D