IDAHO FALLS — What started as a small food trailer serving ice cream in Rexburg has turned into a booming business with locations across the country. Crispy Cones is expanding in Idaho, with Moroni and Karla Corral opening the newest store in Idaho Falls a year ago. Crispy Cones opened in Idaho Falls in April. | Jordan Wood, EastIdahoNews.com The sweet shop serves pastry dough ice cream cones that are grilled rotisserie-style. They’re then cover…