BOSTON ( TheStreet) -- The Russell 2000, the closely followed U.S. small-cap benchmark, reached an all-time high Monday, passing a previous peak reached in 2007. While earnings at small-cap companies, typically defined as those with a market value of less than $3 billion, have impressed investors in 2011, the economy is showing signs of weakness. Still, the following five small-cap stocks have delivered enormous gains this year, rising between 82% and 126%. Here is a look at these high-flying red chips. Some may offer further upside.