Note 5 - Revenue (Tables)

9 Months Ended

Jun. 30, 2021

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended June 30,				Nine Months Ended June 30,
	2021		2020		2021		2020
United States	$	35,810,360	$	25,090,614	$	89,586,498	$	62,765,455
All other countries		2,924,996		879,431		5,932,939		2,991,090
Total Net Sales	$	38,735,356	$	25,970,045	$	95,519,437	$	65,756,545

	Three Months Ended June 30,						Nine Months Ended June 30,
	2021			2020			2021			2020
Broadband service providers		98	%		97	%		98	%		96	%
Legacy customers		2	%		3	%		2	%		4	%
Total Net Sales		100	%		100	%		100	%		100	%