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Note 8 - Derivatives and Fair Value - Loss on Derivative Instruments (Details) - Crude Oil Swaps [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Derivative instruments loss, net | $ (9,542) | $ (9,969) | $ (41,300) | $ (15,923)
Cash Settlements Paid on Matured Derivative Contracts, Net [Member] |  |  |  |
Derivative instruments loss, net | (21,059) | (4,293) | (33,559) | (6,003)
Cash Settlements Not Paid on Matured Derivative Contracts, Net [Member] |  |  |  |
Derivative instruments loss, net | $ 11,517 | $ (5,676) | $ (7,741) | $ (9,920)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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