Note 14 - Concentrations (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

Accounts Receivable	2021				2020
Customer 1	$	206,000	13	%	$	531,000	38	%
Customer 2	$	200,000	13	%	$	337,000	24	%
Customer 3		--	--		$	139,000	10	%

Revenues	2021				2020
Customer 1	$	2,180,000	23	%	$	2,646,000	27	%
Customer 2		1,373,000	15	%	$	938,000	10	%
Customer 3	$	809,000	9	%	$	1,293,000	13	%

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

	Year Ended December 31,
	2021		2020
United States	$	647,000	$	810,000
Costa Rica		292,000		390,000
India		139,000		169,000
All other countries		183,000		55,000
Total equipment, net	$	1,261,000	$	1,424,000