Note 11 - Related Party Transactions (Details Textual) Pure in Millions, $ in Millions	6 Months Ended
Jun. 30, 2022 USD ($)	May 31, 2022 USD ($)
Water Treatment Services [Member]
Related Party Transaction, Amounts of Transaction	$ 1.4
Pilot Exploration Inc. [Member]
Supply Commitment, Minimum Barrels of Produced Water		29.2
Supply Commitment, Amount Committed		$ 6.0

Amount of transactions with related party during the financial reporting period.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

Name:	us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration