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Note 2 - Acquisitions (Details Textual) $ in Thousands		3 Months Ended
Note 2 - Acquisitions (Details Textual) $ in Thousands	Jan. 07, 2025 USD ($) a shares	Jun. 30, 2025 USD ($)	Jun. 24, 2024 a
Wells and Overriding Royalty Interest in Henderson, Anderson, Liberty, and Chambers County, Texas [Member]
Gain (Loss) on Disposition of Oil and Gas Property		$ (424)
Proceeds from Sale of Oil and Gas Property and Equipment		6,825
Wells and Overriding Royalty Interests in Wyoming [Member]
Gain (Loss) on Disposition of Oil and Gas Property		0
Proceeds from Sale of Oil and Gas Property and Equipment		$ 500
Property [Member] \| Kevin Dome Structure [Member] \| Synergy Purchase Agreement [Member]
Oil and Gas, Undeveloped Acreage, Net (Acre) \| a	24,000
Payments to Acquire Productive Assets	$ 2,000
Asset Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) \| shares	1,400,000
Asset Acquisition, Consideration Transferred, Equity Interests Issued or Issuable, Percentage of Outstanding Stock	4.76%
Asset Acquisition, Percentage of Capital Costs Responsible for	100.00%
Asset Acquisition, Repayment of Capital Costs, Period From Closing Date (Month)	78 months
Asset Acqusition, Amount of Capital Costs Incurred Related to Selling Party	$ 20,000
Asset Acquisition, Contingent Consideration, Percentage of Gain on Sale of Initial Gas Processing Plant	18.00%
Asset Acquisition, Consideration Transferred	$ 4,700
Helium Acreage [Member] \| Kevin Dome Structure [Member]
Oil and Gas, Undeveloped Acreage, Net (Acre) \| a			144,000
Synergy Offshore LLC [Member] \| Property [Member] \| Kevin Dome Structure [Member] \| Synergy Purchase Agreement [Member]
Subsidiary, Ownership Percentage, Noncontrolling Owner	20.00%
Synergy Offshore LLC [Member] \| Board of Directors Chairman [Member]
Beneficial Ownership Percentage	60.00%