Note 6 - Exploratory/Extension Well Costs (Details Textual) $ in Millions	6 Months Ended
Jun. 30, 2025 USD ($)
Capitalized Exploratory Well Costs, Maximum Term (Year)	1 year
Oil and Gas, Capitalized Exploratory Well Cost, Capitalized for Period Greater than One Year	$ 10.6

Amount of exploratory well cost capitalized for period of greater than one year after completion of drilling in oil- and gas-producing activities.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 932
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477215/932-235-50-1B

Name:	us-gaap_CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant