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Note 11 - Stockholders' Equity - Details of Warrants Outstanding (Details) | Dec. 31, 2022 $ / shares shares
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Warrant Expiring in February 2029 [Member] |
Number of warrants (in shares) | shares | 2,068,000
Exercise price (in dollars per share) | $ / shares | $ 1.57
Warrants Expiring in April 2032 [Member] |
Number of warrants (in shares) | shares | 2,068,000
Exercise price (in dollars per share) | $ / shares | $ 8.02

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

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- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
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- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Data Type: | na
Balance Type: |
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