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Note 12 - Income Taxes - Reconciliation of Income Taxes (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Income taxes computed at the federal statutory rate | $ 715,000 | $ (332,000)
Change in valuation allowance | (5,000) | 2,711,000
Change in tax rate |  | 6,754,000
Expired net operating loss carryforwards |  | 441,000
Nondeductible compensation, interest expense and other | 40,000 | 39,000
State income taxes, net of federal tax benefit | 155,000 | (41,000)
Change in R&D credit carryover | (66,000) | (133,000)
Stock options and other prior year true-ups | (142,000) | (499,000)
Acquired deferred tax assets of Genasys Spain | (7,800) | (6,564,400)
Refundable Federal AMT Credit | 28,000 |
State business credit utilization | (145,000) |
Provision for income taxes | $ 572,200 | $ 2,375,600

X
- Definition 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. + References No definition available. + Details
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- Definition 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 refundable federal ATM credit. + References No definition available. + Details
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- Definition 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 state business credit utilization. + References No definition available. + Details
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- Definition 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 increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=116821951&loc=d3e32123-109318 + Details
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