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Note 10 - Stockholders' Equity - Fair Value Measurement of Warrant Liability (Details) (Parentheticals) - $ / shares | Dec. 31, 2020 | May 21, 2020 | Dec. 31, 2019
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Warrants (in shares) | 515,000 |  | 0
Warrants, exercise price (in dollars per share) |  | $ 5.00 |

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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 http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant