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Note 4 - Fair Value Measurements - Assets and Liabilities Measured On Recurring Basis (Details) - USD ($) | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Derivatives | $ 39,911,000 | $ 13,591,000
Derivatives | 0 | 4,075,000
Commodity Contract [Member] |  |
Commodity price derivatives | 31,909,000 |
Total liabilities | 31,909,000 |
Fair Value, Recurring [Member] | Commodity Contract [Member] |  |
Commodity price derivatives | 8,002,000 | 2,199,000
Commodity price derivatives | 39,911,000 | 17,666,000
Total recurring fair value measurements | (31,909,000) | (15,467,000)
Derivatives |  | 13,591,000
Derivatives |  | 4,075,000
Total liabilities | 39,911,000 | 17,666,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Commodity Contract [Member] |  |
Commodity price derivatives | 0 | 0
Commodity price derivatives | 0 | 0
Total recurring fair value measurements | 0 | 0
Derivatives |  | 0
Derivatives |  | 0
Total liabilities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Commodity Contract [Member] |  |
Commodity price derivatives | 8,002,000 | 2,199,000
Commodity price derivatives | 39,911,000 | 17,666,000
Total recurring fair value measurements | (31,909,000) | (15,467,000)
Derivatives |  | 13,591,000
Derivatives |  | 4,075,000
Total liabilities | 39,911,000 | 17,666,000
Fair Value, Inputs, Level 3 [Member] | Commodity Contract [Member] |  |
Commodity price derivatives |  | 0
Commodity price derivatives |  | 0
Total recurring fair value measurements |  | 0
Derivatives |  | 0
Derivatives |  | 0
Total liabilities |  | $ 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Commodity Contract [Member] |  |
Commodity price derivatives | 0 |
Commodity price derivatives | 0 |
Total recurring fair value measurements | 0 |
Total liabilities | $ 0 |

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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