Note 5 - Inventories (Details Textual) - USD ($)	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019
Inventory Write-down		$ 2,125,000	$ 77,889
Inventory Valuation Reserves, Ending Balance	$ 3,400,000	3,400,000		$ 1,275,000
Telco [Member]
Inventory Write-down	2,100,000
Inventory Valuation Reserves, Ending Balance	$ 3,400,000	$ 3,400,000		$ 1,300,000