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Note 1 - General and Summary of Significant Accounting Policies (Details Textual) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Number Of Counties In Which Entity Operates	592
Number of States in which Entity Operates	28
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares	0
Accounts Receivable, Allowance for Credit Loss, Current	$ 0
Future Net Revenues To Proved Oil And Natural Gas Reserves Discount Percentage	0.1
Impairment of Oil and Gas Properties	$ 0	$ 0	$ 0
Gain (Loss) Recognition Upon Disposition of Oil and Gas, Minimum Percent of Reserves	25
Texas Franchise Tax Rate	0.75
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Royalty [Member] | Pioneer Natural Resources [Member]
Concentration Risk, Percentage	12	13
Royalty Revenue [Member]
Revenue Allocated To General Partner Percentage	0.04
Net Profits Interests [Member]
Revenue Allocated To General Partner Percentage	1

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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- Definition

The discount percentage for future net revenues to proved oil and natural gas reserves.

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- Definition

Gain or loss recognition upon disposition of oil and gas involving greater than the stated percentage of reserves.

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- Definition

The number of counties the entity operates in.

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- Definition

The percentage of revenue allocated to the general partner.

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Represents the Texas franchise tax rate.

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- Definition

Amount of allowance for credit loss on accounts receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

+ References

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-SubTopic 10
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- Definition

The number of states the entity operates in as of the balance sheet date.

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