Note 10 - Concentration of Credit Risk (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

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

	Three Months Ended					Three Months Ended
	June 30 , 2020					June 30 , 2019
Customer	Net Sales		% of Net Sales			Net Sales		% of Net Sales
Customer A	$	2,508,000		43	%	$	2,769,000		30	%

	Six Months Ended					Six Months Ended
	June 30, 2020					June 30, 2019
Customer	Net Sales		% of Net Sales			Net Sales		% of Net Sales
Customer A	$	5,675,000		44	%	$	6,630,000		37	%