Note 7 - Hedging Program and Derivatives - Derivative Contracts (Details) - Fixed Swap 2021 [Member]	6 Months Ended
Jun. 30, 2021 $ / bbl
Daily volume	750
Swap price (in USD per Barrel of Oil)	52.50

Amount of daily production of the applicable energy source.

No definition available.

Name:	us-gaap_OilAndGasDeliveryCommitmentsAndContractsDailyProduction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration