Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Joint Venture Drilling Program (Details Textual)

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Note 4 - Joint Venture Drilling Program (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 12, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Property, Plant and Equipment, Net, Ending Balance   $ 713,063   $ 713,063   $ 748,798
Other Assets, Noncurrent, Total   27,535   27,535   33,447
Asset Retirement Obligation, Ending Balance   374,807   374,807   355,594
Revenue from Contract with Customer, Excluding Assessed Tax, Total   55,241 $ 134,701 179,369 $ 250,781  
Monza Energy, LLC [Member]            
Property, Plant and Equipment, Net, Ending Balance   13,100   13,100    
Other Assets, Noncurrent, Total   2,600   2,600    
Asset Retirement Obligation, Ending Balance   200   200    
Increase (Decrease) in Working Capital       1,400    
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           16,100
Other Assets, Noncurrent, Total           5,300
Asset Retirement Obligation, Ending Balance           100
Increase (Decrease) in Working Capital           2,700
Cash Call Balance   11,100   11,100   $ 5,300
Revenue from Contract with Customer, Excluding Assessed Tax, Total       4,800 4,000  
Operating Costs and Expenses, Total       6,300 $ 2,500  
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%          
Capital Contribution Payments from Related Party   289,300   289,300    
Capital Contributions from Related Party During Period       60,400    
Capital Contribution Payments to Related Party, Net   $ 54,000   $ 54,000    
Monza Energy, LLC [Member] | JV Drilling Program [Member] | Mr. Tracy W. Krohn [Member]            
Capital Commitment to Joint Venture $ 14,500