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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Retained Earnings [Member]
Common dividends declared, per share (in dollars per share)	$ 0.66	$ 0.16
Additional Paid-in Capital [Member]
Common stock options exercised, shares (in shares)	1,697	1,500
Treasury Stock [Member]
Issuance of treasury stock to 401(k) plan, shares (in shares)	4,943	5,243
Purchase of treasury shares, shares (in shares)	187,300	6,800
Purchase of treasury shares, per share (in dollars per share)	$ 28.87	$ 24.07
Common dividends declared, per share (in dollars per share)	$ 0.66	$ 0.16

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Aggregate dividends declared during the period for each share of common stock outstanding.

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