Consolidated Statement of Equity (Deficit) (Parentheticals)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Statement Of Stockholders Equity [Abstract]
Purchases of treasury stock, in shares	98,056
Preferred stock, Shares Authorized	60,000,000
Preferred stock, No Par Value | $ / shares	$ 0
Preferred stock, shares issued	2,000,000