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v3.21.1

Note 1 - Organization and Significant Accounting Policies - Weighted Average Assumptions (Details) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Measurement Input, Risk Free Interest Rate [Member] |  |
Warrants and right, measurement input | 0.001 | 0.019
Measurement Input, Expected Dividend Rate [Member] |  |
Warrants and right, measurement input | 0.000 | 0.000
Measurement Input, Expected Term [Member] |  |
Warrants and right, measurement input | 0.2 | 1.7
Measurement Input, Price Volatility [Member] |  |
Warrants and right, measurement input | 0.568 | 0.703

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- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExpectedTermMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |