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Note 11 - Income Tax (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Components of net deferred income tax assets |
|  | December 31, |
|  | 2020 |  |  | 2019 |
Deferred tax assets: |  |  |  |  |  |
Federal net operating loss carryforward |  |  | 39,340,000 |  |  |  | 36,803,000 |
Stock based compensation and other items |  |  | 4,779,000 |  |  |  | - |
Intellectual property |  |  | 58,504,000 |  |  |  | 58,504,000 |
Accrued expense |  |  | - |  |  |  | 1,262,000 |
Patent amortization |  |  | 4,000 |  |  |  | 4,000 |
Deferred tax assets before valuation |  |  | 102,627,000 |  |  |  | 96,573,000 |
Valuation allowance |  |  | (102,627,000 | ) |  |  | (96,573,000 | )
Net deferred income tax assets |  |  | - |  |  |  | - |
Reconciliation of the federal statutory income tax rate |
|  | December 31, 2020 |  | December 31, 2019
Federal statutory income tax rate |  |  | 21 | % |  |  | 21 | %
State tax, net of federal benefit |  |  | 7 | % |  |  | 7 | %
Change in valuation allowance on net operating loss carry-forwards |  |  | (28 | %) |  |  | (28 | %)
Effective income tax rate |  |  | 0 | % |  |  | 0 | %

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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://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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