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Note 14 - Income Taxes - Significant Portion of Net Deferred Tax Asset (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Net operating loss carryforwards | $ 11,769 | $ 11,985
Deferred Tax Assets, Tax Credit Carryforwards, Research | 5,479 | 5,686
Share-based compensation | 538 | 317
Patents | 8 | 15
Accruals and other | 2,487 | 2,526
Allowances | 237 | 183
Gross deferred tax asset | 20,518 | 20,712
Equipment | (352) | (405)
Operating ROU assets | (1,222) | (1,334)
Acquired intangible assets | (2,592) | 0
Gross deferred tax liabilities | (4,166) | (1,739)
Less valuation allowance | (8,313) | (7,878)
Total deferred tax assets, net of valuation allowance | $ 8,039 | $ 11,095

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