Note 11 - Related Party Transactions (Details Textual) - Pilot Exploration Inc. [Member] Pure in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	May 31, 2022
Supply Commitment, Minimum Barrels of Produced Water				29.2
Water Treatment Services [Member]
Related Party Transaction, Amounts of Transaction			$ 2.0
Water Treatment Services [Member] | Flat Top Operating Area [Member]
Related Party Transaction, Amounts of Transaction		$ 1.5	$ 1.6
Water Treatment Services [Member] | Flat Top Operating Area [Member] | Forecast [Member]
Related Party Transaction, Amounts of Transaction	$ 6.5