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Note 12 - Income Taxes - Significant Portion of Net Deferred Tax Asset (Details) - USD ($) | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Net operating loss carryforwards | $ 13,644,000 | $ 16,443,000
Deferred Tax Assets, Tax Credit Carryforwards, Research | 5,805,000 | 2,559,000
Share-based compensation | 532,000 | 898,000
Equipment | (41,000) | (80,000)
Patents | 35,000 | 69,000
Accruals and other | 818,000 | 546,000
State tax deduction | (5,000) | (7,000)
Federal AMT Credit | 53,000 | 52,000
Allowances | 133,000 | 157,000
Gross deferred tax asset | 20,974,000 | 20,637,000
Less valuation allowance | (15,017,000) | (12,306,000)
Total deferred tax assets, net of valuation allowance | $ 5,957,000 | $ 8,331,000

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