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Note 8 - Derivatives and Fair Value - Gain Loss on Derivative Instruments (Details) - Crude Oil Swaps [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Derivative instruments loss, net | $ 31 | $ (9,542) | $ 52 | $ (41,300)
Cash Settlements Paid on Matured Derivative Contracts, Net [Member] |  |  |  |
Derivative instruments loss, net | (4) | (21,059) | (63) | (33,559)
Unrealized Gain (Loss) [Member] |  |  |  |
Derivative instruments loss, net | $ 35 | $ 11,517 | $ 115 | $ (7,741)

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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 -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A + Details
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