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Note 6 - Debt (Details Textual) $ in Millions | Jan. 05, 2022 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jul. 26, 2022 USD ($)
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Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | Fed Funds Effective Rate Overnight Index Swap Rate [Member] |  |  |  |
Credit Agreement [Member] |  |  |  |  |
Debt Instrument, Face Amount | $ 15 |  | $ 20 |  | $ 20
Line of Credit Facility, Maximum Borrowing Capacity | $ 100 |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.50% |  |  |  |
Debt Instrument, Covenant, Ratio of Total Debt to EBITDAX | 3 |  |  |  |
Debt Instrument, Covenant, Ratio of Consolidated Current Assets to Consolidated Current Liabilities | 1 |  |  |  |
Long-Term Debt, Gross |  | $ 7 |  | $ 5 |
Credit Agreement [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument, Applicable Margin on Basis Spread | 0.25% |  |  |  |
Debt Instrument, Covenant, Restricted Payment, Percentage of Existing Borrowing Base | 20.00% |  |  |  |
Credit Agreement [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument, Applicable Margin on Basis Spread | 1.25% |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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