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Note 3 - Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Revenue | $ 32,316 | $ 44,552
Oil Sales[Member] |  |
Revenue | 28,352 | 36,293
Natural Gas, Midstream [Member] |  |
Revenue | 3,964 | 8,259
Rockies [Member] |  |
Revenue | 10,390 | 15,456
Rockies [Member] | Oil Sales[Member] |  |
Revenue | 10,064 | 14,318
Rockies [Member] | Natural Gas, Midstream [Member] |  |
Revenue | 326 | 1,138
West Texas, South Texas, and Gulf Coast [Member] |  |
Revenue | 12,351 | 17,115
West Texas, South Texas, and Gulf Coast [Member] | Oil Sales[Member] |  |
Revenue | 11,820 | 15,561
West Texas, South Texas, and Gulf Coast [Member] | Natural Gas, Midstream [Member] |  |
Revenue | 531 | 1,554
South Texas [Member] |  |
Revenue |  | 7,158
South Texas [Member] | Oil Sales[Member] |  |
Revenue |  | 6,384
South Texas [Member] | Natural Gas, Midstream [Member] |  |
Revenue |  | 774
Mid-Continent [Member] |  |
Revenue | 9,575 | 11,981
Mid-Continent [Member] | Oil Sales[Member] |  |
Revenue | 6,468 | 6,414
Mid-Continent [Member] | Natural Gas, Midstream [Member] |  |
Revenue | $ 3,107 | 5,567
West Texas [Member] |  |
Revenue |  | 5,739
West Texas [Member] | Oil Sales[Member] |  |
Revenue |  | 5,408
West Texas [Member] | Natural Gas, Midstream [Member] |  |
Revenue |  | 331
Gulf Coast [Member] |  |
Revenue |  | 4,218
Gulf Coast [Member] | Oil Sales[Member] |  |
Revenue |  | 3,769
Gulf Coast [Member] | Natural Gas, Midstream [Member] |  |
Revenue |  | $ 449

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 924 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479941/924-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-30 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-40 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-4 + Details
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