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Note 13 - Income Taxes - Significant Portion of Net Deferred Tax Asset (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Net operating loss carryforwards | $ 10,054 | $ 11,769
Research and development credit | 4,712 | 5,479
Share-based compensation | 688 | 538
Patents | 2,331 | 8
Accruals and other | 2,245 | 2,487
Allowances | 280 | 237
Gross deferred tax assets | 20,310 | 20,518
Equipment | (313) | (352)
Operating ROU assets | (1,066) | (1,222)
Acquired intangible assets | (2,180) | (2,592)
Gross deferred tax liabilities | 3,559 | 4,166
Less valuation allowance | (9,378) | (8,313)
Net deferred tax assets and liabilities | $ 7,373 | $ 8,039

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