Warranty (Schedule Of Warranty) (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Warranty [Abstract]
Beginning Balance	$ 634,000	$ 616,000
Actual warranty costs paid	(145,000)	(124,000)
Amounts charged to expense	98,000	93,000
Ending balance	$ 587,000	$ 585,000
Warranty liability period	5 years