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Note 4 - Income Taxes (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Federal net operating loss carryforward | $ 15,949,000 | $ 19,819,000
Other | 0 | 1,634,000
Patent amortization | (6,000) | (11,000)
Deferred tax assets before valuation | 15,943,000 | 21,442,000
Valuation allowance | (15,943,000) | (21,442,000)
Net deferred income tax assets | $ 0 | $ 0

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