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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment, Net, Ending Balance   $ 748,798       $ 515,421       $ 748,798 $ 515,421  
Other Assets, Noncurrent, Total   33,447       91,547       33,447 91,547  
Asset Retirement Obligation, Ending Balance   355,594       310,137       355,594 310,137 $ 300,446
Revenue from Contract with Customer, Excluding Assessed Tax, Total   $ 151,894 $ 132,221 $ 134,701 $ 116,080 143,422 $ 153,459 $ 149,612 $ 134,213 534,896 580,706 487,096
Other Nonoperating Income (Expense), Total                   $ (188) 3,871 $ (5,127)
JV Drilling Program [Member] | Mr. Tracy W. Krohn [Member]                        
Minority Interest Ownership Percentage By Joint Venture   4.50%               4.50%    
Monza Energy, LLC [Member]                        
Property, Plant and Equipment, Net, Ending Balance   $ 16,100       8,800       $ 16,100 8,800  
Other Assets, Noncurrent, Total   5,300       3,300       5,300 3,300  
Asset Retirement Obligation, Ending Balance   100               100    
Increase (Decrease) in Working Capital                   2,700 700  
Cash Call Balance   5,300       $ 20,600       5,300 20,600  
Revenue from Contract with Customer, Excluding Assessed Tax, Total                   11,900 4,300  
Operating Costs and Expenses, Total                   7,400 2,300  
Other Nonoperating Income (Expense), Total                     $ 200  
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   273,300               273,300    
Capital Contributions from Related Party During Period                   30,200    
Capital Contribution Payments to Related Party, Net   59,700               59,700    
Monza Energy, LLC [Member] | JV Drilling Program [Member] | Mr. Tracy W. Krohn [Member]                        
Capital Commitment to Joint Venture   $ 14,500               $ 14,500