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Note 15 - Subsequent Events - Schedule of Natural Gas Derivatives (Details) - Natural Gas Derivative Swap [Member] - Not Designated as Hedging Instrument [Member] - Forecast [Member] | 3 Months Ended
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Mar. 31, 2027 MMBTU $ / MMBTU | Dec. 31, 2026 MMBTU $ / MMBTU | Sep. 30, 2026 MMBTU $ / MMBTU | Jun. 30, 2026 MMBTU $ / MMBTU | Mar. 31, 2026 MMBTU $ / MMBTU | Dec. 31, 2025 MMBTU $ / MMBTU | Sep. 30, 2025 MMBTU $ / MMBTU | Jun. 30, 2025 MMBTU $ / MMBTU
MMBtu Per Day (Millions of British Thermal Unit) | MMBTU | 19,667 | 30,000 | 30,000 | 30,000 | 19,667 | 30,000 | 30,000 | 30,000
Price per MMBtu (in USD per Millions of British Thermal Unit) | $ / MMBTU | 4.3 | 4.3 | 4.3 | 4.3 | 4.43 | 4.43 | 4.43 | 4.43
Net Investment Hedging [Member] |  |  |  |  |  |  |  |
MMBtu Per Day (Millions of British Thermal Unit) | MMBTU |  |  |  |  | 10,333 |  |  |
Price per MMBtu (in USD per Millions of British Thermal Unit) | $ / MMBTU |  |  |  |  | 4.3 |  |  |

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- Definition Nominal energy measure used to calculate payments on a derivative instrument. + References No definition available. + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:energyItemType
Balance Type: | na
Period Type: | duration

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- Definition Fixed price related to the price risk swap derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeSwapTypeFixedPrice
Namespace Prefix: | us-gaap_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=hpk_NaturalGasDerivativeSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_NetInvestmentHedgingMember
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Data Type: | na
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