Consolidated Statements of Changes in Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Stockholders' Equity [Abstract]
Cash dividends per share preferred stock (in dollars per share)	$ 2.50	$ 2.50
Cash dividends per share common stock (in dollars per share)	$ 0.10	$ 0.10
Shares of common stock purchased	20,070	24,886
Shares of common stock issued	2,104,305	2,098,833