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Note 1 - Summary of Significant Accounting Policies - Fair Value Measurement of Warrant Liability (Details) (Parentheticals) - $ / shares | Jun. 30, 2020 | May 21, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Warrants (in shares) | 515,000 |  | 0
Warrants, exercise price (in dollars per share) | $ 5.00 | $ 5.00 |

X
- 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
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant