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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2012
Summary Of Significant Accounting Policies Tables  
Computation of basic and diluted earnings (loss) per share
    2011     2012  
Weighted average shares outstanding – used to compute basic earnings (loss) per share     5,617,535       6,973,704  
Net effect of dilutive potential common shares outstanding, based on the treasury stock method     ––       ––  
Weighted average shares outstanding – used to compute diluted earnings (loss) per share     5,617,535       6,973,704