Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Summary Of Significant Accounting Policies [Abstract]

Schedule Of Warranty

	Year Ended December 31
		2017		2016
Beginning balance	$	600,000	$	554,000
Amounts charged to expense		93,000		147,000
Actual warranty costs paid		(90,000)		(101,000)
Ending balance	$	603,000	$	600,000

Components Of Accumulated Other Comprehensive Loss

	Foreign Currency Translation		Unrealized (loss)/gain on securities		Accumulated Other Comprehensive Loss
December 31, 2016	$	(704,000)	$	17,000	$	(687,000)
Net current period change		79,000		(5,000)		74,000
December 31, 2017	$	(625,000)	$	12,000	$	(613,000)