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Stock-Based Compensation (Details Textual)	3 Months Ended
Stock-Based Compensation (Details Textual)	Mar. 31, 2013	Mar. 31, 2012
Stock Issued During Period, Shares, Restricted Stock Award, Gross	32,972	23,830
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	103,138	59,046
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited	54,639	20,142
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	0	14,684
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	68,882	76,759

Number of shares related to Restricted Stock Award forfeited during the period.

Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

Number of share options (or share units) exercised during the current period.