Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Series C Preferred Stock [Member]
Issuance of stock (in shares)	286,888
Cash dividends declared on preferred stock (in dollars per share)	$ 0.225
Series D Preferred Stock [Member]
Issuance of stock (in shares)	133,705
Cash dividends declared on preferred stock (in dollars per share)	$ 0.20
Exercise of stock options (in shares)		53,586
Issuance of stock (in shares)	419,173	58,445
Issuance of common stock for restricted stock awards (in shares)	8,400	6,750
Cash dividends declared on common stock (in dollars per share)	$ 1.12	$ 1.08