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Note 4 - Related Party Transactions - Significant Activities Between Partnerships (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Net Profits Interests Payments Receivableor Accrued [Member] |  |  |
Related Party Transaction, Amounts of Transaction | $ 8,275 | $ 7,170 | $ 6,822
Net Profits Interests Revenue [Member] |  |  |
Related Party Transaction, Amounts of Transaction | 34,338 | 28,207 | 17,596
General and Administrative Amounts (Receivable) Payable[Member] |  |  |
Related Party Transaction, Amounts of Transaction | 162 | 68 | 85
Total General and Administrative Expenses [Member] |  |  |
Related Party Transaction, Amounts of Transaction | $ 5,108 | $ 3,399 | $ 571

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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 850 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483326/850-10-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483326/850-10-50-3 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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- Details
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- Details
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- Details
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