A downgrade from a single analyst -- Wedbush -- was all it took to send Krispy Kreme Doughnuts (KKD) rolling downhill earlier this week. But did investors overreact? Sure, the stock's more than doubled over the past year. True, it carries a higher P/E ratio than either Starbucks (SBUX -0.81%) or Dunkin' Brands (DNKN).

But as Motley Fool contributor Rich Smith explains, that's only the start of the story at Krispy Kreme. Click through to hear the rest -- and learn why even after a clean double, Rich thinks the stock's still worth buying.