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Note 12 - Income Taxes - Significant Portion of Net Deferred Tax Asset (Details) - USD ($) | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Net operating loss carryforwards | $ 12,682,000 | $ 13,644,000
Deferred Tax Assets, Tax Credit Carryforwards, Research | 5,856,000 | 5,805,000
Share-based compensation | 506,000 | 532,000
Equipment | (78,000) | (41,000)
Patents | 24,000 | 35,000
Accruals and other | 1,222,000 | 818,000
State tax deduction | (6,000) | (5,000)
Federal AMT Credit | 24,000 | 53,000
Allowances | 169,000 | 133,000
Gross deferred tax asset | 20,399,000 | 20,974,000
Less valuation allowance | (15,012,000) | (15,017,000)
Total deferred tax assets, net of valuation allowance | $ 5,387,000 | $ 5,957,000

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