Warranty (Schedule Of Warranty) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Warranty [Abstract]
Beginning Balance	$ 590,000	$ 634,000
Amounts charged to expense	90,000	87,000
Actual warranty costs paid	(123,000)	(97,000)
Ending balance	$ 557,000	$ 623,000