Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Patents [Member]

Schedule of Patent Cost and Other Asset

Patent costs, which are included in Other assets in the accompanying Consolidated Balance Sheets, as of December 31 were as follows (in thousands):

	2019			2018
Patent costs	$	1,992		$	1,979
Accumulated amortization		(1,483	)		(1,380	)
	$	509		$	599