Annual report pursuant to Section 13 and 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
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment, Net, Ending Balance   $ 686,878       $ 748,798       $ 686,878 $ 748,798  
Other Assets, Noncurrent, Total   22,470       33,447       22,470 33,447  
Asset Retirement Obligation, Ending Balance   392,704       355,594       392,704 355,594 $ 310,137
Revenue from Contract with Customer, Excluding Assessed Tax, Total   94,748 $ 72,517 $ 55,241 $ 124,128 151,894 $ 132,221 $ 134,701 $ 116,080 346,634 534,896 $ 580,706
Monza Energy, LLC [Member]                        
Asset Retirement Obligation, Ending Balance   200               200    
Increase (Decrease) in Working Capital                   1,300    
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       16,100       9,900 16,100  
Other Assets, Noncurrent, Total   1,800       5,300       1,800 5,300  
Asset Retirement Obligation, Ending Balance           100         100  
Increase (Decrease) in Working Capital                     2,700  
Cash Call Balance   7,300       $ 5,300       7,300 5,300  
Revenue from Contract with Customer, Excluding Assessed Tax, Total                   8,400 11,900  
Operating Costs and Expenses, Total                   12,100 $ 7,400  
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                   70,800    
Capital Contribution Payments to Related Party, Net   $ 51,800               $ 51,800    
Monza Energy, LLC [Member] | JV Drilling Program [Member] | Mr. Tracy W. Krohn [Member]                        
Capital Commitment to Joint Venture $ 14,500