Note 10 - Income Taxes (Details) - Significant Portion of Net Deferred Tax Asset (USD $)	Sep. 30, 2014	Sep. 30, 2013
Significant Portion of Net Deferred Tax Asset [Abstract]
Net operating loss carryforwards	$ 16,920,000	$ 19,576,000
Research and development credit	2,182,000	2,257,000
Share-based compensation	414,000	526,000
Equipment	(6,000)	(18,000)
Patents	174,000	230,000
Accruals and other	630,000	463,000
State tax deduction	(3,000)	(2,000)
Federal AMT Credit	49,000	49,000
Allowances	131,000	127,000
Gross deferred tax asset	20,491,000	23,208,000
Less valuation allowance	$ (20,491,000)	$ (23,208,000)

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the allowance for doubtful accounts.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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