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Note 7 - Convertible Notes (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Jul. 04, 2022 | Feb. 02, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | May 04, 2022 | Dec. 31, 2021
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 0 | $ (59) |  |
Convertible Debt |  |  |  | $ 0 |  |  |
Conversion of Director Notes Into Common Stock [Member] |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) |  |  |  |  | 11,088 |  |
Phyto IV LP [Member] | Convertible Debt [Member] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 150 |
Gain (Loss) on Extinguishment of Debt |  | $ 8 |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  | $ 28.85 |  |  |  | $ 72.12 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 10.00% |
Debt Instrument, Extension Fee Percentage |  |  |  |  |  | 1.50% |
Convertible Debt Issued to Various Investors [Member] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 555 |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  | $ 28.85 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 10.00% |  |  |  |  |
Debt Instrument, Extension Fee Percentage |  | 1.50% |  |  |  |  |
Convertible Debt Issued to Various Investors [Member] | Conversion of Debt and Interest Into Common Stock [Member] |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) | 19,628 |  |  |  |  |  |
WPC and Origa [Member] | Convertible Debt and Stock Warrants [Member] |  |  |  |  |  |  |
Warrants and Rights Outstanding |  | $ 551 | $ 478 |  |  |  |
WPC and Origa [Member] | Side Letter [Member] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | 2,936 | 1,886 |  |  |  | $ 1,000
Gain (Loss) on Extinguishment of Debt |  | $ 509 | $ (576) |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  | $ 28.85 | $ 72.12 |  |  |  |
Phyto IV LP [Member] | Conversion of Debt and Interest Into Common Stock [Member] |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) | 5,386 |  |  |  |  |  |

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