Note 4 - Acquisitions - Preliminary Acquisition Consideration (Details) - USD ($)		6 Months Ended
	Jan. 18, 2018	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Cash paid		$ 2,246,545
Goodwill		2,603,687
Genasys Acquisition [Member]
Cash paid	$ 2,826,189
Acquisition escrow liability	185,250
Total consideration	$ 3,011,439
Cash and restricted cash acquired		579,644
Accounts receivable		426,940
Fixed assets		5,712
Intangible assets		1,850,000
Goodwill		2,603,688
Other assets		54,520
Total assets acquired		5,520,504
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