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Note 12 - Subsequent Events (Details Textual) - USD ($) $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 22, 2024 | Apr. 11, 2024 | Apr. 01, 2024 | Apr. 30, 2024 | Mar. 31, 2024 | Mar. 31, 2023
Proceeds from Issuance of Common Stock |  |  |  |  | $ 11,972 | $ 7,174
Subsequent Event [Member] | Provivi, Inc. [Member] | Debt Securities [Member] |  |  |  |  |  |
Proceeds from Sale, Maturity and Collection of Investments |  |  | $ 4,700 |  |  |
Proceeds from Debt Securities, End-of-term, Amount |  |  | $ 300 |  |  |
Subsequent Event [Member] | Better Place Forests Co. [Member] |  |  |  |  |  |
Payments to Acquire Investments |  | $ 500 |  |  |  |
Subsequent Event [Member] | CAMP NYC, Inc [Member] | Debt Securities [Member] |  |  |  |  |  |
Proceeds from Sale, Maturity and Collection of Investments | $ 1,000 |  |  |  |  |
The 2023 Equity Distribution Agreement [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 1,053,796 |
Proceeds from Issuance of Common Stock |  |  |  |  | $ 12,000 |
Payments of Stock Issuance Costs |  |  |  |  | $ 300 |
The 2023 Equity Distribution Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  | 526,581 |  |
Proceeds from Issuance of Common Stock |  |  |  | $ 5,800 |  |
Payments of Stock Issuance Costs |  |  |  | $ 100 |  |

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