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Note 16 - Subsequent Events (Details Textual) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Oct. 21, 2025 | Oct. 09, 2025 | Oct. 31, 2025 | Dec. 31, 2025 | Sep. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Impairment, Oil and Gas, Property with Unproved and Proved Reserves |  |  |  |  | $ 869,000 |  | $ 1,424,000 | $ 3,628,000 | $ 6,843,000 |
Stock Issued During Period, Value, New Issues |  |  |  |  |  | $ 11,877,000 |  |  |  |
Asset Retirement Obligation, Liabilities Settled |  |  |  |  |  |  |  | $ 493,000 |  | $ 5,435,000
Subsequent Event [Member] | West Texas Assets [Member] |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Oil and Gas Property and Equipment | $ 60,000 |  |  |  |  |  |  |  |  |
Asset Retirement Obligation, Liabilities Settled |  |  | $ 5,100,000 |  |  |  |  |  |  |
Subsequent Event [Member] | Common Stock Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Equity Agreement, Maximum Amount |  | $ 25,000,000 |  |  |  |  |  |  |  |
Equity Agreement, Discount on Stock Price, Percent |  | 2.50% |  |  |  |  |  |  |  |
Equity Agreement, Outstanding Shares, Percent |  | 19.99% |  |  |  |  |  |  |  |
Equity Agreement, Beneficial-Ownership Blocker, Percent |  | 4.99% |  |  |  |  |  |  |  |
Equity Agreement, Structuring Fee |  | $ 25,000 |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 223,141 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  | $ 270,000 |  |  |  |  |  |  |  |
Equity Agreement, Cash Commitment Fee |  | 180,000 |  |  |  |  |  |  |  |
Credit Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Proceeds from Lines of Credit |  |  | $ 1,000,000 |  |  |  |  |  |  |
Minimum [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |
Impairment, Oil and Gas, Property with Unproved and Proved Reserves |  |  |  | $ 800,000 |  |  |  |  |  |
Maximum [Member] | Subsequent Event [Member] | Common Stock Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Equity Agreement, Cash Proceeds from Resale of Shares |  | $ 270,000 |  |  |  |  |  |  |  |
Maximum [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |
Impairment, Oil and Gas, Property with Unproved and Proved Reserves |  |  |  | $ 1,800,000 |  |  |  |  |  |

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