Note 7 - Inventories - Schedule of Inventory (Details) - USD ($)	Mar. 31, 2019	Sep. 30, 2018
Inventory Valuation Reserve	$ (4,850,000)	$ (4,965,000)
Inventories, net of allowance for excess and obsolete inventory of $4,850,000 and $4,965,000, respectively	19,404,567	18,888,042
Cable TV [Member]
Inventory Valuation Reserve	(4,050,000)	(4,150,000)
Cable TV [Member] | New Inventory [Member]
Inventory, Gross	12,247,466	12,594,138
Cable TV [Member] | Refurbished and Used Inventory [Member]
Inventory, Gross	2,791,141	2,981,413
Telco [Member]
Inventory Valuation Reserve	(800,000)	(815,000)
Telco [Member] | New Inventory [Member]
Inventory, Gross	2,002,539	1,371,545
Telco [Member] | Refurbished and Used Inventory [Member]
Inventory, Gross	$ 7,213,421	$ 6,905,946