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Note 13 - Income Taxes - Significant Portion of Net Deferred Tax Asset (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Net operating loss carryforwards | $ 11,985 | $ 12,682
Deferred Tax Assets, Tax Credit Carryforwards, Research | 5,686 | 5,856
Share-based compensation | 317 | 506
Equipment | (405) | (78)
Patents | 15 | 24
Accruals and other | 2,526 | 1,222
State tax deduction |  | (6)
Federal AMT Credit |  | 24
Allowances | 183 | 169
Right of use asset | 1,334 |
Gross deferred tax asset | 18,973 | 20,399
Less valuation allowance | (7,878) | (15,012)
Total deferred tax assets, net of valuation allowance | $ 11,095 | $ 5,387

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