GEOGRAPHIC INFORMATION (Tables)

12 Months Ended

Dec. 31, 2020

Segment Reporting [Abstract]

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

The following table presents summary geographic information about revenues and long-lived assets (land and property, net of accumulated depreciation) attributed to countries based upon location of our customers or assets:

	Year ended December 31,				December 31,
	2020		2019		2020		2019
					Long-lived		Long-lived
	Revenues		Revenues		Assets		Assets
United States	$	5,955,000	$	5,809,000	$	2,306,000	$	2,411,000
South Korea		460,000		650,000		-		-
China		135,000		228,000		747,000		789,000
Taiwan		11,000		45,000		164,000		186,000
Other foreign countries		135,000		51,000		-		-
Total	$	6,696,000	$	6,783,000	$	3,217,000	$	3,386,000