Consolidated Statements of Shareholders' Equity (Parentheticals) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Shares of common stock issued for the exercise of stock options	262,101
Dividends declared per common share (in Dollars per share)	$ 2.54	$ 0.88	$ 0.76
Common Stock [Member]
Shares of common stock issued for the exercise of stock options	262,101	58,671	17,573
Issuance of restriced shares, net of forfeitures	3,358	14,323	9,238
Treasury Stock [Member]
Shares of treasury stock purchased	108,031	17,288	20,349