Note 16 - Segment Reporting - Segment Reporting Information (Details) - USD ($)	3 Months Ended												12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Sales													$ 55,118,297	$ 27,473,282	$ 25,907,571
Gross profit	$ 1,723,389	$ 2,272,035	$ 3,310,635	$ 1,786,463	$ 2,180,028	$ 1,805,683	$ 1,993,351	$ 1,438,153	$ 1,623,287	$ 2,009,370	$ 1,881,439	$ 1,558,142	9,092,522	7,417,215	7,072,238
Operating income (loss)													(3,976,114)	(3,797,957)	(2,916,351)
Segment assets	36,828,344				44,394,620				54,847,605				36,828,344	44,394,620	54,847,605
Cable TV [Member] | Discontinued Operations [Member]
Segment assets					18,450,498				24,158,314					18,450,498	24,158,314
Operating Segments [Member] | Wireless [Member]
Sales													22,918,535
Gross profit													1,997,041
Operating income (loss)													(1,513,280)
Segment assets	5,515,793												5,515,793
Operating Segments [Member] | Telco [Member]
Sales													32,254,303	27,522,696	25,994,521
Gross profit													7,095,481	7,417,215	7,072,238
Operating income (loss)													(2,462,834)	(3,797,957)	(2,916,351)
Segment assets	22,619,565				22,173,797				24,135,091				22,619,565	22,173,797	24,135,091
Intersegment Eliminations [Member]
Sales													(54,541)	(49,414)	(86,950)
Segment Reconciling Items [Member]
Segment assets	$ 8,692,986				$ 3,770,325				$ 6,554,200				$ 8,692,986	$ 3,770,325	$ 6,554,200