Note 8 - Concentration of Credit Risk (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

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

	Three Months Ended					Three Months Ended
	March 31, 2022					March 31, 2021
Customer	Net Sales		% of Net Sales			Net Sales		% of Net Sales
Customer A	$	2,502,000		43	%	$	3,991,000		60	%
Customer B		1,347,000		23			1,294,000		19