Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Summary of Significant Accounting Policies [Abstract]

Schedule of Warranty

	Year Ended December 31
		2020		2019
Beginning balance	$	513,000	$	554,000
Amounts charged to expense		59,000		10,000
Actual warranty costs paid		(67,000)		(51,000)
Ending balance	$	505,000	$	513,000

Components of Accumulated Other Comprehensive Loss

	Foreign Currency Translation		Unrealized (loss)/gain on securities		Accumulated Other Comprehensive Loss
December 31, 2018	$	(764,000)	$	13,000	$	(751,000)
Net current period change		55,000		(2,000)		53,000
December 31, 2019	$	(709,000)	$	11,000	$	(698,000)
Net current period change		9,000		10,000		19,000
December 31, 2020	$	(700,000)	$	21,000	$	(679,000)