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Note 3 - Acquisitions for Units (Details Textual) $ in Thousands |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 29, 2023 USD ($) a shares | Aug. 31, 2023 USD ($) a shares | Jul. 12, 2023 USD ($) a shares | Sep. 30, 2022 USD ($) a shares | Mar. 31, 2022 USD ($) a shares | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Number Of Counties In Which Entity Operates |  |  |  |  |  | 593 |
Oil and Gas Property, Full Cost Method, Net |  |  |  |  |  | $ 120,118 | $ 112,250
An Unrelated Third Party [Member] | Mineral And Royalty Interest [Member] |  |  |  |  |  |  |
Area of Real Estate Property (Acre) | a | 716 |  |  |  |  |  |
Number Of Counties In Which Entity Operates | 3 |  |  |  |  |  |
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares | 494,000 |  |  |  |  |  |
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable | $ 14,400 |  |  |  |  |  |
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received |  |  |  |  |  | 900 |
Oil and Gas Property, Full Cost Method, Net |  |  |  |  |  | 13,400 |
Multiple Unrelated Third Party [Member] | Mineral And Royalty Interest [Member] |  |  |  |  |  |  |
Area of Real Estate Property (Acre) | a |  | 568 |  |  |  |  |
Number Of Counties In Which Entity Operates |  | 3 |  |  |  |  |
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares |  | 374,000 |  |  |  |  |
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable |  | $ 10,400 |  |  |  |  |
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received |  |  |  |  |  | 300 |
Oil and Gas Property, Full Cost Method, Net |  |  |  |  |  | 10,100 |
Excess Energy, LLC [Member] | Mineral And Royalty Interest [Member] |  |  |  |  |  |  |
Area of Real Estate Property (Acre) | a |  |  | 900 | 2,100 |  |  |
Number Of Counties In Which Entity Operates |  |  | 13 | 12 |  |  |
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares |  |  | 343,750 | 816,719 |  |  |
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable |  |  | $ 11,000 | $ 20,400 |  |  |
Oil and Gas Property, Full Cost Method, Net |  |  |  |  |  | 10,400 | 19,000
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received, Net |  |  |  |  |  |  | 900
Costs Incurred, Acquisition of Unproved Oil and Gas Properties |  |  |  |  |  |  | 1,800
Multiple Related Parties for the Acquisition Closed on July 12, 2023 [Member] | Mineral And Royalty Interest [Member] |  |  |  |  |  |  |
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received, Net |  |  |  |  |  | 500 |
Unrelated Third Parties [Member] | Mineral And Royalty Interest [Member] |  |  |  |  |  |  |
Area of Real Estate Property (Acre) | a |  |  |  |  | 3,600 |  |
Number Of Counties In Which Entity Operates |  |  |  |  | 13 |  |
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable, Number of Shares (in shares) | shares |  |  |  |  | 570,000 |  |
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable |  |  |  |  | $ 14,800 |  |
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received |  |  |  |  |  |  | 800
Oil and Gas Property, Full Cost Method, Net |  |  |  |  |  |  | $ 14,000
Unrelated Third Parties [Member] | Mineral And Royalty Interest [Member] | Excess [Member] |  |  |  |  |  |  |
Asset Acquisition Consideration Transferred Royalty and Mineral Revenue Received |  |  |  |  |  | $ 500 |

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