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Note 16 - Subsequent Events (Details Textual) - USD ($) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Common Stock, Par or Stated Value Per Share (in dollars per share) |  | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001
Class of Warrant or Right, Issued During Period (in shares) |  | 0 | 0 | 0 | 0 |
Subsequent Event [Member] | The Note [Member] | Senior Secured Promissory Note [Member] |  |  |  |  |  |
Repayments of Notes Payable | $ 1,400,000 |  |  |  |  |
Subsequent Event [Member] | Pre-Funded Warrants [Member] |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) | 17,200,000 |  |  |  |  |
Class of Warrant or Right, Issued During Period, Price Per Share (in dollars per share) | $ 0.175 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 0.001 |  |  |  |  |
Subsequent Event [Member] | Common Warrants [Member] |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) | 21,430,000 |  |  |  |  |
Class of Warrant or Right, Issued During Period, Price Per Share (in dollars per share) | $ 0.175 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 0.175 |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) | 5 years |  |  |  |  |
Subsequent Event [Member] | Public Offering [Member] |  |  |  |  |  |
Units Issued During Period, Units, New Issues (in shares) | 21,430,000 |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 4,230,000 |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.0001 |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ 3,300,000 |  |  |  |  |

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