Annual report pursuant to Section 13 and 15(d)

Supplemental Oil and Gas Disclosures - Unaudited (Details Textual)

v3.22.0.1
Supplemental Oil and Gas Disclosures - Unaudited (Details Textual)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
MMBTU
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
MMBTU
Asset Retirement Obligation, Period Increase (Decrease) Due To Acquisitions Incurred and Revisions | $ $ 36.2 $ 15.2 $ 37.5
Proved Developed and Undeveloped Reserve, Extension and Discovery (Energy) (Millions of Barrels of Oil Equivalent) 27.1    
Proved Undeveloped Reserve Net Energy Converted Outside of Five Years (Millions of Barrels of Oil Equivalent) 2.5    
Proved Developed and Undeveloped Reserve, Net (Energy), Ending Balance (Millions of Barrels of Oil Equivalent) 20.6    
Seismic Costs | $ $ 0.1 0.3 7.8
Geological And Geophysical Costs | $ $ 5.7 $ 4.5 $ 5.7
Percentage Of Proved Undeveloped Reserves Expected To Be Developed 12.00%    
Present Value Discounted Percentage 10.00%    
Percentage Of Non Operated Proved Developed Nonproducing Reserves 25.30%    
Changes Due To Price [Member]      
Proved Developed and Undeveloped Reserve, Extension and Discovery (Energy) (Millions of Barrels of Oil Equivalent) 27.7   10.0
Mississippi Canyon 800 (Gladden) Field [Member]      
Proved Developed and Undeveloped Reserve, Extension and Discovery (Energy) (Millions of Barrels of Oil Equivalent) 0.9    
Mobile Bay and Fairway Properties [Member]      
Proved Developed and Undeveloped Reserve, Extension and Discovery (Energy) (Millions of Barrels of Oil Equivalent) 26.2    
Mississippi Canyon 243 Field [Member]      
Wells Expected To Be Drilled Year 2023    
Virgo Deepwater Fields [Member]      
Wells Expected To Be Drilled Year 2024