Note 12 - Concentrations (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]

	Year Ended December 31,
	2020		2019
United States	$	810,000	$	1,108,000
Costa Rica		390,000		582,000
India		169,000		225,000
All other countries		55,000		113,000
Total equipment, net	$	1,424,000	$	2,028,000