Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2019
Sales	$ 11,959,125	$ 12,889,940	$ 25,921,483	$ 25,921,483	$ 19,700,037	$ 19,700,037
Telco [Member] | Operating Segments [Member]
Sales	7,287,275	8,672,016	14,451,752		15,482,113
Wireless Services [Member]
Sales	4,671,850	4,217,924	11,469,731		4,217,924
Equipment Sales [Member] | Intersegment Eliminations [Member]
Sales		(3,905)			(44,147)
Equipment Sales [Member] | Telco [Member] | Operating Segments [Member]
Sales	6,981,478	8,258,719	13,764,461		14,878,129
Telco Repair [Member]
Sales	7,792	10,400	16,202		14,000
Telco Recycle [Member]
Sales	$ 298,005	$ 406,802	$ 671,089		$ 634,131