CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Issuance of common stock to non-employee directors	5,814	5,922	4,410
Dividends paid (in dollars per share)	$ 0.72	$ 0.72	$ 0.68
Stock Options
Exercise of stock options	10,250	26,500	500