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Note 12 - Income Taxes - Reconciliation of Income Taxes (Details) - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Income taxes computed at the federal statutory rate	$ (332,000)	$ (231,000)
Change in valuation allowance	2,711,000	197,000
Change in tax rate	6,754,000
Expired net operating loss carryforwards	441,000	283,000
Nondeductible compensation, interest expense and other	39,000	21,000
State income taxes, net of federal tax benefit	(41,000)	(24,000)
Change in R&D credit carryover	(133,000)	(98,000)
Stock options and other prior year true-ups	(499,000)	48,000
Acquired deferred tax assets of Genasys Spain	(6,564,400)	1,600
Provision for income taxes	$ 2,375,600	$ 197,600

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the expiration of net operating loss carryforwards.

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