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Note 11 - Subsequent Events (Details Textual) - USD ($) | 1 Months Ended | 2 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2021 | Mar. 15, 2021 | Mar. 12, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  | 19,106,504 | 17,415,859
Proceeds from Warrant Exercises |  |  |  | $ 8,046,103 | $ 3,888,425
Proceeds from Issuance of Common Stock |  |  |  | $ 10,827,100 |
Subsequent Event [Member] |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  | 4,230,000 |  |  |
Proceeds from Warrant Exercises |  | $ 2,200,000 | $ 2,000,000 |  |
Proceeds from Issuance of Common Stock | $ 1,000,000 |  |  |  |
Subsequent Event [Member] | Underwriter Warrants in Connection with the February 2021 Common Stock Offering [Member] |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 1,682,927 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1.28125 |  |  |  |
Warrants and Rights Outstanding, Term (Year) | 5 years |  |  |  |
Subsequent Event [Member] | Public Offering, Inclusive of Underwriter Shares [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 33,658,538 |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ 1.025 |  |  |  |
Underwriter Option to Purchase Additional Shares, Term (Day) | 30 days |  |  |  |
Proceeds from Issuance of Common Stock | $ 31,200,000 |  |  |  |

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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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