Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Joint Venture Drilling Program (Details Textual)

v3.21.1
Note 4 - Joint Venture Drilling Program (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 12, 2018
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Property, Plant and Equipment, Net, Ending Balance   $ 668,969   $ 686,878
Other Assets, Noncurrent, Total   22,613   22,470
Asset Retirement Obligation, Ending Balance   398,897   392,704
Revenue from Contract with Customer, Excluding Assessed Tax, Total   125,647 $ 124,128  
Monza Energy, LLC [Member]        
Property, Plant and Equipment, Net, Ending Balance   8,000    
Other Assets, Noncurrent, Total   4,100    
Asset Retirement Obligation, Ending Balance   200   200
Increase (Decrease) in Working Capital   1,600   1,300
JV Drilling Program [Member] | Monza Energy, LLC [Member]        
Capital Contribution Payments from Related Party   302,400    
Capital Contributions from Related Party During Period   71,500    
Capital Contribution Payments to Related Party, Net   53,000    
JV Drilling Program [Member] | Mr. Tracy W. Krohn [Member]        
Minority Interest Ownership Percentage By Joint Venture 4.50%      
Monza Energy, LLC [Member]        
Property, Plant and Equipment, Net, Ending Balance       9,900
Other Assets, Noncurrent, Total       1,800
Cash Call Balance   6,300   7,300
Revenue from Contract with Customer, Excluding Assessed Tax, Total   2,500   8,400
Operating Costs and Expenses, Total   $ 3,400   $ 12,100
Monza Energy, LLC [Member] | JV Drilling Program [Member]        
Amount Committed by Investors $ 361,400      
Joint Venture Working Interest Percentage Contributed to Related Party 88.94%      
Joint Venture Working Interest Percent 11.06%      
Oil and Gas Revenue, Percent 30.00%      
Well Cost, Percent 20.00%      
Monza Energy, LLC [Member] | JV Drilling Program [Member] | Mr. Tracy W. Krohn [Member]        
Capital Commitment to Joint Venture $ 14,500