(Image source: burblife.wordpress.com) Shares of Dollar Tree, Inc. (NASDAQ:DLTR) are advancing this morning after the discount retailer posted first quarter earnings that slightly beat estimates. The company earned 67 cents a share on revenue of $2 billion; compared to the same period a year ago the company earned 59 cents a share on revenue of $1.87 billion. Analysts’ expectation for the quarter was earnings of 66 cents per share on revenues of $2.01 billion. Dollar Tree also raised its full-year earnings outlook, but outlook was one penny below the high end estimate from analysts.