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Note 11 - Subsequent Events (Details Textual) |  |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Nov. 10, 2024 USD ($) $ / ft | Nov. 05, 2024 USD ($) $ / shares shares | Jan. 31, 2023 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($)
Payments to Acquire Property, Plant, and Equipment |  |  |  | $ 522,000 | $ 3,815,000
Subsequent Event [Member] | Mojave Groundwater Banking Project Pipe Agreement [Member] |  |  |  |  |
Payments to Acquire Property, Plant, and Equipment | $ 5,000,000 |  |  |  |
Arrangement, Payment per Extension | $ 1,000,000 |  |  |  |
Arrangement, Acquisition Price Per Unit (in USD per Foot) | $ / ft | 155 |  |  |  |
Direct Offering [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | shares |  |  | 10,500,000 |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares |  |  | $ 3.84 |  |
Proceeds from Issuance of Common Stock, Gross |  |  | $ 40,320,000 |  |
Proceeds from Issuance of Common Stock, Net |  |  | $ 38,500,000 |  |
Direct Offering [Member] | Subsequent Event [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | shares |  | 7,000,000 |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares |  | $ 3.34 |  |  |
Proceeds from Issuance of Common Stock, Gross |  | $ 23,400,000 |  |  |
Proceeds from Issuance of Common Stock, Net |  | $ 21,900,000 |  |  |

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