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Note 5 - Warrants - Assumptions Used (Details) | Dec. 31, 2022 | Dec. 31, 2021
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Minimum [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |
Warrants, assumptions | 0.042 | 0.001
Minimum [Member] | Measurement Input, Price Volatility [Member] |  |
Warrants, assumptions | 0.631 | 0.718
Minimum [Member] | Measurement Input, Expected Term [Member] |  |
Warrants, assumptions | 0.1 | 0.1
Maximum [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |
Warrants, assumptions | 0.048 | 0.011
Maximum [Member] | Measurement Input, Price Volatility [Member] |  |
Warrants, assumptions | 0.763 | 1.145
Maximum [Member] | Measurement Input, Expected Term [Member] |  |
Warrants, assumptions | 2.6 | 3.6

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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 https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
Name: | us-gaap_WarrantsAndRightsOutstandingMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputPriceVolatilityMember
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
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |