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Consolidated Balance Sheets (Parentheticals) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Allowance for doubtful accounts (in Dollars) $ 73,970 $ 57,415
Preferred stock, shares authorized (in Shares) 1,250,000 1,250,000
Preferred stock - shares issued (in Shares) 0 0
Preferred stock - shares outstanding (in Shares) 0 0
Preferred stock - no par value (in Dollars per share) $ 0 $ 0
Common stock shares authorized (in Shares) 250,000,000 250,000,000
Common stock shares issued (in Shares) 44,322,159 53,497,584
Common stock shares outstanding (in Shares) 44,322,159 53,497,584
Common stock - no par value (in Dollars per share) $ 0 $ 0