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Note 10 - Income Taxes - Significant Portion of Net Deferred Tax Asset (Details) - USD ($) | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Net operating loss carryforwards | $ 16,443,000 | $ 16,410,000
Deferred Tax Assets, Tax Credit Carryforwards, Research | 2,559,000 | 2,461,000
Share-based compensation | 898,000 | 598,000
Equipment | (80,000) | (23,000)
Patents | 69,000 | 102,000
Accruals and other | 546,000 | 832,000
State tax deduction | (7,000) | (7,000)
Federal AMT Credit | 52,000 | 52,000
Allowances | 157,000 | 211,000
Gross deferred tax asset | 20,637,000 | 20,636,000
Less valuation allowance | (12,306,000) | (12,109,000)
Total deferred tax assets, net of valuation allowance | $ 8,331,000 | $ 8,527,000

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details
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