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Note 4 - Derivative Instruments (Details Textual) BTU in Millions | 12 Months Ended
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Dec. 31, 2023 BTU
Call Option [Member] |
Derivative, Nonmonetary Notional Amount, Energy Measure (British Thermal Unit) | 0.3

X
- 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

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