Annual report pursuant to Section 13 and 15(d)

Changes in Stockholders Equity (parenthetical)

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Changes in Stockholders Equity (parenthetical) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stock-based compensation expense, including excess tax benefit $ 2,725,533 $ 2,010,221 $ 0