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Note 2 - Acquisitions and Divestitures (Details Textual) $ in Thousands, shares in Millions		3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 24, 2024 USD ($) a shares	Jun. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Jun. 25, 2024 a
Proceeds from Sale of Property, Plant, and Equipment		$ 400
Gain (Loss) on Disposition of Oil and Gas Property		0
Asset Retirement Obligation, Liabilities Settled		$ 100	$ 144		$ 458
Proceeds from Sale of Oil and Gas Property and Equipment			$ 247	$ 0
Asset Retirement Obligations, Relief Through Disposals					500
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
TEXAS
Number of Wells [Member]		1
NEW MEXICO
Number of Wells [Member]		3
Helium Acreage [Member] | Kevin Dome Structure [Member]
Oil and Gas, Undeveloped Acreage, Net (Acre) | a	144,000					24,000
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 [Member]	$ 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
-Section 1208
-Paragraph b
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 805
-SubTopic 50
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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(2)
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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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