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 12 Months Ended
Mar. 12, 2018
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Property, Plant and Equipment, Net, Ending Balance   $ 730,044   $ 748,798
Other Assets, Noncurrent, Total   30,084   33,447
Asset Retirement Obligation, Ending Balance   364,100   355,594
Revenue from Contract with Customer, Excluding Assessed Tax, Total   124,128 $ 116,080  
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   15,100   16,100
Other Assets, Noncurrent, Total   4,200   5,300
Asset Retirement Obligation, Ending Balance   100   100
Increase (Decrease) in Working Capital   2,400   2,700
Cash Call Balance   18,300   $ 5,300
Revenue from Contract with Customer, Excluding Assessed Tax, Total   3,300 1,600  
Operating Costs and Expenses, Total   3,100 $ 900  
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    
Capital Contributions from Related Party During Period   45,900    
Capital Contribution Payments to Related Party, Net   $ 57,100    
Monza Energy, LLC [Member] | JV Drilling Program [Member] | Mr. Tracy W. Krohn [Member]        
Capital Commitment to Joint Venture $ 14,500