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Note 2 - Acquisitions and Divestitures (Details Textual) $ in Thousands, shares in Millions		3 Months Ended			9 Months Ended		12 Months Ended
	Jun. 24, 2024 USD ($) a shares	Sep. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Jun. 25, 2024 a
Asset Acquisition, Transaction Costs		$ 368		$ 0	$ 368	$ 0
Proceeds from Sale of Oil and Gas Property and Equipment					$ 5,866	$ 0
Asset Retirement Obligations, Relief Through Disposals							$ 500
Wells in Texas New Mexico [Member]
Number of Wells [Member]					245
Proceeds from Sale of Property, Plant, and Equipment					$ 5,900
Gain (Loss) on Disposition of Oil and Gas Property					1,400
Wells and Overriding Royalty Interests in North Dakota, New Mexico, and Texas [Member]
Gain (Loss) on Disposition of Oil and Gas Property							0
Proceeds from Sale of Oil and Gas Property and Equipment							7,000
Disposal Group,Transaction Costs							$ 400
Number of Wells Sold							152
Number of Overriding Royalty Interests Sold							7
Helium Acreage [Member] | Synergy Offshore LLC [Member]
Oil and Gas, Undeveloped Acreage, Net (Acre) | a								24
Asset Acquisition, Transaction Costs					$ 368
Asset Acquisition, Consideration Transferred, Transaction Cost			$ 547
Helium Acreage [Member] | Synergy Offshore LLC [Member] | Evaluation Expense, Land and Helium Reserve [Member]
Asset Acquisition, Consideration Transferred, Transaction Cost			$ 179
Helium Acreage [Member] | Kevin Dome Structure [Member]
Oil and Gas, Undeveloped Acreage, Net (Acre) | a	144
Number of Wells [Member]	2
Payments to Acquire Productive Assets	$ 2,000
Asset Acquisition, Equity Interest Issued or Issuable, Number of Shares [Member] (in shares) | shares	2.6
Asset Acquisition, Transaction Costs	$ 400
Asset Acquisition, Percentage of Capital Costs Responsible for [Member]	100.00%
Helium Acreage [Member] | Kevin Dome Structure [Member] | Minimum [Member]
Asset Acqusition, Amount of Capital Costs Incurred Related to Selling Party [Member]	$ 20,000
Helium Acreage [Member] | Kevin Dome Structure [Member] | US Energy [Member]
Purchase and Sale Agreement, Percentage of Rights Acquired [Member]	82.50%
Helium Acreage [Member] | Kevin Dome Structure [Member] | WaveTech [Member}
Purchase and Sale Agreement, Percentage of Rights Acquired [Member]	17.50%
Asset Acquisition, Consideration Transferred, Equity Interest Issued and Issuable	$ 2,700

X

- Definition

Leased area representing summation of fractional ownership working interest to whole on which oil and gas wells have not been drilled or completed that would permit production of economic quantities of oil and gas. Excludes area of undrilled acreage held by production under terms of lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 229
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-Paragraph b
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