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Note 5 - Income Taxes (Details) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred tax assets: |  |
Federal net operating loss carryforward | $ 15,400,000 | $ 14,481,000
Other | 1,028,000 | 871,000
Patent amortization | (13,000) | (15,000)
Deferred tax assets before valuation | 16,415,000 | 15,337,000
Valuation allowance | (16,415,000) | (15,337,000)
Net deferred income tax assets | $ 0 | $ 0

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