Note 16 - Subsequent Events - Commodity Derivative Contracts (Details) - Designated as Hedging Instrument [Member] - Subsequent Event [Member]	Apr. 30, 2021 $ / item
Crude Oil Derivative Swap Q2 2021 [Member]
Volume (Bbls)	152,500
Price per Bbl (in USD per Per Share)	61.4	[1]
Crude Oil Derivative Swap Q3 2021 [Member]
Volume (Bbls)	230,000
Price per Bbl (in USD per Per Share)	61.4	[1]
Crude Oil Derivative Swap Q4 2021 [Member]
Volume (Bbls)	230,000
Price per Bbl (in USD per Per Share)	61.4	[1]
Crude Oil Derivative Swap 2021 [Member]
Volume (Bbls)	612,500
Price per Bbl (in USD per Per Share)	61.4	[1]
Crude Oil Derivative Swap Q1 2022 [Member]
Volume (Bbls)	225,000
Price per Bbl (in USD per Per Share)	61.4	[1]
Crude Oil Derivative Swap Q2 2022 [Member]
Volume (Bbls)	75,000
Price per Bbl (in USD per Per Share)	61.4	[1]
Crude Oil Derivative Swap 2022 [Member]
Volume (Bbls)	300,000
Price per Bbl (in USD per Per Share)	61.4	[1]

[1] Participating earnings represent the distributed and undistributed earnings of the Company attributable to the participating securities. Unexercised stock option awards do not participate in undistributed net losses as they are not contractually obligated to do so.