Women's fashion and jewellery retailer Coldwater Creek Inc on Thursday revealed it doubled its first quarter net earnings to $2.8 million, or 26 cents per diluted share, from the year-ago period. The Idaho-based company, which sells its products via stores, catalogues and websites, said sales for the period ending June 1 were flat at $112 million but its profit benefited from lower marketing costs and better cost control systems.