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Shareholders' Equity (Detail Textuals) (Share Repurchase Program)	3 Months Ended
	Mar. 31, 2013	Oct. 31, 2008	Jan. 31, 2006
Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized to be purchased (in shares)		200,000	250,000
Number of shares purchased under purchase program (in shares)	268,777
Remaining number of shares authorized to be purchased (in shares)	181,223
Shares purchased during period	16,952

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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