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Note 1 - General and Summary of Significant Accounting Policies (Details Textual) shares in Thousands, $ in Thousands | 12 Months Ended
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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 |  |

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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 -URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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