Dave Petso has been a wealth manager in Boise, Idaho since the 1980s. His business has survived multiple recessions, the bursting of the dot-com bubble and the 2008 financial crisis.For most of Petso's 45-year career, Micron, the hometown maker of computer memory, has been a boring enterprise tech company and, in his words, a "terrible investment."But almost four years into the artificial intelligence craze, the sleepy semiconductor company is one of the hottest names on the planet, turning many...