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Note 7 - Financial Instruments (Details Textual) $ / shares in Units, shares in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2022 | Dec. 31, 2021 USD ($) shares | Sep. 02, 2016 USD ($) $ / shares shares
(Gain) Loss on Change in Fair Value of Warrant Liability | $ (0) | $ 1,066,522 | $ (400,663) | $ (294,548) |  |  |
Warrants and Rights Outstanding | $ 0 |  | 0 |  |  | $ 6,521,441 |
The 2016 Warrant [Member] |  |  |  |  |  |  |
Class of Warrant or Right Outstanding, Common Stock Value Used to Determine Number of Shares Called |  |  |  |  |  |  | $ 4,000,000.0
Class of Warrant or Right Outstanding, Common Stock Price Per Share Used to Determine Number of Shares Called (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 2.29
Warrants and Rights Outstanding, Term (Year) |  |  |  |  |  |  | 10 years
Class of Warrant or Right, Subscription Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 1.50
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 1.50
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares |  |  |  |  |  | 1.0 | 2.7
(Gain) Loss on Change in Fair Value of Warrant Liability |  |  | $ 400,000 |  |  |  |
Warrants and Rights Outstanding |  |  |  |  |  | $ 6,500,000 |
The 2016 Warrant [Member] | Measurement Input, Expected Dividend Rate [Member] |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  |  |  | 0 | 0 |
The 2016 Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  |  |  |  | 0.0121 |
The 2016 Warrant [Member] | Measurement Input, Expected Term [Member] |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  |  |  |  | 4.7 |
The 2016 Warrant [Member] | Measurement Input, Price Volatility [Member] |  |  |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  |  |  |  | 0.55 |

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