Consolidated Statement of Stockholders' Equity (Unaudited) (Parentheticals)	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Statement of Stockholders' Equity [Abstract]
Shares repurchased (in shares)	120,372
Shares issued for stock-based awards (in shares)	116,314
Dividends on common stock, per share (in dollars per share) | $ / shares	$ 0.28