Note 14 - Segment Reporting - Segment Reporting Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019
Sales	$ 12,021,820	$ 17,559,315	$ 37,943,303	$ 37,259,352
Gross profit	4,170,579	4,587,405	7,323,924	9,787,310
Operating income (loss)	(1,149,977)	(253,079)	(17,619,741)	(2,610,377)
Segment assets	36,109,590		36,109,590		$ 36,828,344
Operating Segments [Member] | Wireless [Member]
Sales	5,123,175	8,733,444	16,592,907	12,951,368
Gross profit	2,251,153	2,235,406	4,298,915	3,524,164
Operating income (loss)	(253,416)	(454,672)	(4,136,645)	(1,568,255)
Operating Segments [Member] | Wireless [Member] | Continuing Operations [Member]
Segment assets	5,082,120		5,082,120		5,515,793
Operating Segments [Member] | Telco [Member]
Sales	6,898,645	8,825,871	21,350,396	24,307,984
Gross profit	1,919,426	2,351,999	3,025,009	6,263,146
Operating income (loss)	(896,561)	$ 201,593	(13,483,096)	$ (1,042,122)
Operating Segments [Member] | Telco [Member] | Continuing Operations [Member]
Segment assets	12,274,168		12,274,168		22,619,565
Segment Reconciling Items [Member]
Segment assets	$ 18,753,302		$ 18,753,302		$ 8,692,986