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Note 3 - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019
Indefinite-lived Intangible Assets (Excluding Goodwill), Ending Balance | $ 8,639,000 | $ 8,639,000 |
Operating Lease, Right-of-Use Asset | 247,043 |  |
Operating Lease, Liability, Total | 247,043 |  |
Accounting Standards Update 2016-02 [Member] |  |  |
Operating Lease, Right-of-Use Asset |  |  | $ 300,000
Operating Lease, Liability, Total |  |  | $ 300,000
In-Process Research and Development Asset [Member] |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill), Ending Balance | 8,600,000 | 8,600,000 |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | $ 0 | $ 0 |
Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 2 years |  |
Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 15 years |  |

X
- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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