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Note 7 - Long-term Debt (Details Textual) |  |  |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 22, 2022 USD ($) $ / shares shares | Mar. 01, 2022 USD ($) | Apr. 08, 2021 USD ($) $ / shares shares | Jun. 30, 2022 USD ($) $ / shares | Jun. 21, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) $ / shares | Jun. 30, 2021 USD ($) | May 17, 2022 $ / shares | Dec. 31, 2021 USD ($) $ / shares | May 21, 2020 $ / shares shares
Stock Issued During Period, Shares, Issued for Commitment Fee (in shares) | shares |  |  | 80,000 |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  | $ 0.001 | $ 0.001 |  |  | $ 0.001 |  | $ 0.001 | $ 0.001 |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 515,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 5.00
Senior Promissory Notes Warrant [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares | 4,250,000 |  |  |  |  |  |  |  |  |  |
Senior Promissory Notes Placement Agent Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares | 230,000 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 0.65 |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) | 5 years |  |  |  |  |  |  |  |  |  |
Senior Promissory Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 6,000,000.0 |  |  | $ 6,000,000 |  |  | $ 6,000,000 |  |  | $ 0 |
Debt Instrument, Interest Rate, Stated Percentage | 10.00% |  |  |  |  |  |  |  |  |  |
Interest Expense, Debt, Total |  |  |  |  |  |  | 6,891 | $ 0 |  |  |
Debt Instrument, Term (Month) | 24 months |  |  |  |  |  |  |  |  |  |
Debt Instrument, Stated Rate, Monthly Increase if Unpaid | 1.00% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount, Total | $ 664,704 |  |  | 657,813 |  |  | 657,813 |  |  | $ (0) |
Senior Promissory Notes [Member] | Measurement Input, Expected Term [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Measurement Input | 2.5 |  |  |  |  |  |  |  |  |  |
Senior Promissory Notes [Member] | Measurement Input, Share Price [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Measurement Input | 0.43 |  |  |  |  |  |  |  |  |  |
Senior Promissory Notes [Member] | Measurement Input, Exercise Price [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Measurement Input | 0.65 |  |  |  |  |  |  |  |  |  |
Senior Promissory Notes [Member] | Measurement Input, Price Volatility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Measurement Input | 0.808 |  |  |  |  |  |  |  |  |  |
Senior Promissory Notes [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Measurement Input | 0.0313 |  |  |  |  |  |  |  |  |  |
Senior Promissory Notes [Member] | Measurement Input, Forfeiture Rate [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Measurement Input | 0 |  |  |  |  |  |  |  |  |  |
Senior Promissory Notes [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 16.00% |  |  |  |  |  |  |  |  |  |
Convertible Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 15,000,000.0 |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  | 112.00% |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio |  |  | 0.1006749 |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.00% |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal |  | $ 840,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Covenant, Floor Price (in dollars per share) | $ / shares |  |  | $ 1.75 |  |  |  |  |  |  |  |
Repayments of Convertible Debt | $ 13,446,875 | $ 840,000 |  |  | $ 2,520,000 |  |  |  |  |  |
Repayments of Convertible Debt, Principal | 11,640,000 |  |  |  |  |  |  |  |  |  |
Repayments of Convertible Debt, Premium | $ 1,806,875 |  |  |  |  |  |  |  |  |  |
Interest Expense, Debt, Total |  |  |  | 121,458 |  | $ 170,834 | 308,958 | 170,834 |  |  |
Amortization of Debt Issuance Costs |  |  |  | $ 1,915,727 |  | $ 251,804 | $ 2,213,065 | $ 251,804 |  |  |

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