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Note 4 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Components of net deferred income tax assets |
|  | December 31,
|  | 2017 |  | 2016
Deferred tax assets: |  |  |  |  |  |  |  |
Federal net operating loss carryforward |  | $ | 15,949,000 |  |  | $ | 19,819,000 |
Other |  |  | — |  |  |  | 1,634,000 |
Patent amortization |  |  | (6,000 | ) |  |  | (11,000 | )
Deferred tax assets before valuation |  |  | 15,943,000 |  |  |  | 21,422,000 |
Valuation allowance |  |  | (15,943,000 | ) |  |  | (21,422,000 | )
Net deferred income tax assets |  | $ | — |  |  | $ | — |

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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