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Note 10 - Income Taxes - Significant Portion of Net Deferred Tax Asset (Details) - USD ($)
Sep. 30, 2016
Sep. 30, 2015
Net operating loss carryforwards $ 16,410,000 $ 16,966,000
Deferred Tax Assets, Tax Credit Carryforwards, Research 2,461,000 2,309,000
Share-based compensation 598,000 468,000
Equipment (23,000) (24,000)
Patents 102,000 134,000
Accruals and other 832,000 465,000
State tax deduction (7,000) (6,000)
Federal AMT Credit 52,000 52,000
Allowances 211,000 150,000
Gross deferred tax asset 20,636,000 20,514,000
Less valuation allowance (12,109,000) (12,175,000)
Total deferred tax assets, net of valuation allowance $ 8,527,000 $ 8,339,000