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Note 11 - Capital Structure (Details Textual) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Dec. 10, 2020 | Jul. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Common Stock, Shares Authorized (in shares) |  |  | 200,000,000 | 200,000,000 |  | 200,000,000 |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001 |
Preferred Stock, Shares Authorized (in shares) |  |  | 50,000,000 | 50,000,000 |  | 50,000,000 |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001 |
Common Stock, Shares, Outstanding, Ending Balance (in shares) |  |  | 12,583,736 | 17,882,893 |  | 17,882,893 |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) |  |  | 0 | 0 |  | 0 |
Stock Issued During Period, Value, New Issues |  |  |  | $ 28,317,444 |  |  |
Payments of Stock Issuance Costs |  |  |  |  |  | $ 4,292,781 | $ 741,650
Class of Warrant or Right, Issued During Period (in shares) |  |  |  |  |  | 403,760 |
Wainwright [Member] |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.0001 |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 4,791,667 |  |  |  |  |  |
Underwriting Agreement, Commitment Offering, Shares (in shares) | 4,166,667 |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ 6 |  |  |  |  |  |
Underwriting Agreement, Overallotment Option, Shares (in shares) | 625,000 |  |  |  |  |  |
Conversion of Debt to Common Stock [Member] |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount | $ 800,000 |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) | 130,081 |  |  |  |  |  |
Warrants Issued in Connection with March Offerings [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  | 92,302 |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 92,302 |  |  |  |  |
Class of Warrant or Right, Issued During Period, Exercise Price (in dollars per share) |  | $ 15.99 |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  | 1 year |  |  |  |  |
Warrants and Rights Outstanding |  | $ 356,000 |  |  |  |  |
Warrants Issued in Connection With Wainwright Offering [Member] |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) | 311,458 |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 311,458 |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) | 5 years |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 7.50 |  |  |  |  |  |
At-the-market Offering [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 430,230 | 352,912 | 0 |  |
Stock Issued During Period, Value, New Issues |  |  | $ 6,800,000 | $ 3,600,000 |  |  |
Payments of Stock Issuance Costs |  |  | $ 200,000 | $ 100,000 |  |  |
The March Offerings [Member] |  |  |  |  |  |  |
Payments of Stock Issuance Costs |  | $ 1,500,000 |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |
Common Stock, Shares, Outstanding, Ending Balance (in shares) |  |  |  | 365,869 |  | 365,869 |

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