Note 10 - Concentration of Credit Risk (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

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

	Three Months Ended					Three Months Ended
	September 30, 2021					September 30, 2020
Customer	Net Sales		% of Net Sales			Net Sales		% of Net Sales
Customer A	$	3,304,000		53	%	$	3,737,000		63	%
Customer B	$	617,000		10	%	$	-		0	%%

	Nine Months Ended					Nine Months Ended
	September 30, 2021					September 30, 2020
Customer	Net Sales		% of Net Sales			Net Sales		% of Net Sales
Customer A	$	10,648,000		53	%	$	8,190,000		44	%
Customer B	$	2,384,000		12	%	$	2,912,000		16	%