Inventories (Schedule Of Potential Impact Of LIFO Valuation to FIFO Valuation) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Inventories [Abstract]
Cost of Sales	$ (1,250)	$ 443	$ 763
Net Earnings	$ 830	$ (292)	$ (505)
Earnings Per Share	$ 0.12	$ (0.04)	$ (0.07)