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Note 4 - Acquisition - Preliminary Acquisition Consideration (Details) - USD ($)		12 Months Ended
	Jan. 18, 2018	Sep. 30, 2018	Sep. 30, 2017
Cash paid at closing		$ 2,431,795
Assets Acquired
Goodwill, Ending Balance		$ 2,445,990
Genasys Acquisition [Member]
Cash paid at closing	$ 2,826,189
Acquisition escrow liability	185,250
Total consideration	3,011,439
Assets Acquired
Cash and restricted cash acquired	579,644
Accounts receivable	426,940
Fixed assets	5,712
Intangible assets	1,850,000
Goodwill, Ending Balance	2,603,688
Other assets	54,520
Total assets acquired	5,520,504
Liabilities assumed
Accounts payable	275,653
Accrued expenses and other liabilities	315,817
Severance obligation	397,558
Debt	1,520,037
Total liabilities assumed	2,509,065
Net assets acquired	$ 3,011,439