Property, Plant and Equipment & Natural Gas Properties - Narrative (Details) $ / shares in Units, $ in Thousands	Sep. 30, 2025 USD ($) $ / shares shares	Sep. 30, 2025 TJ	Sep. 30, 2025 MMcf / d	Sep. 30, 2025 km	Sep. 30, 2025	Jun. 30, 2025 USD ($)	Apr. 30, 2024 compressor
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 348					$ 308
Sturt plateau compression facility (“SPCF”), volume		40	39
Sturt plateau pipeline (SPP), distance | km				35
Falcon Acquisition
Property, Plant and Equipment [Line Items]
Number of shares transferred | shares	6,537,503
Total consideration transferred	$ 22,700
Falcon Acquisition | Employee stock option
Property, Plant and Equipment [Line Items]
Shares issued (in shares) | shares	369,084
Exercise price (in USD per share) | $ / shares	$ 21.94
Falcon Acquisition | Falcon
Property, Plant and Equipment [Line Items]
Percentage of ownership interest					98.10%
Falcon Acquisition | TXM Oil and Gas Exploration Kft, Falcon Oil & Gas Ireland Limited, Falcon Oil & Gas Ireland Limited, Falcon Oil & Gas Holdings Ireland Limited and Falcon Exploration, Production South Africa (Pty) Ltd
Property, Plant and Equipment [Line Items]
Percentage of ownership interest					100.00%
Unproved properties
Property, Plant and Equipment [Line Items]
Natural gas properties, successful efforts method:	$ 378,802					342,314
Assets under construction - natural gas equipment
Property, Plant and Equipment [Line Items]
Natural gas properties, successful efforts method:	$ 34,868					$ 24,441
Essential plant components, number of compressors | compressor							2