Consolidated Statements of Shareholders' Equity (Parentheticals) - $ / shares	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Tax withholdings for Directors, Employee Benefit and Stock Plans (in shares)	1,560	3,310	6,952	1,327	3,360	4,151
Dividends paid per Common Share (in dollars per share)	$ 0.22	$ 0.22	$ 0.22	$ 0.21	$ 0.21	$ 0.21