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, 2019
Mar. 31, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Property, Plant and Equipment, Net, Ending Balance   $ 524,512     $ 524,512   $ 515,421
Other Assets, Noncurrent, Total   73,577     73,577   91,547
Revenue from Contract with Customer, Excluding Assessed Tax, Total   134,701   $ 149,612 250,781 $ 283,825  
Other Nonoperating Income (Expense), Total   (478)   $ (486) (809) (514)  
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   13,400     13,400   8,800
Other Assets, Noncurrent, Total   2,300     2,300   3,300
Increase (Decrease) in Working Capital         3,400   $ 700
Revenue from Contract with Customer, Excluding Assessed Tax, Total         4,000 500  
Operating Costs and Expenses, Total         2,500 400  
Other Nonoperating Income (Expense), Total           $ 200  
Cash Calls Received from Joint Venture   80,300     80,300    
Monza Energy, LLC [Member] | Advances from Joint Interest Partners [Member]              
Cash Calls Received from Joint Venture   $ 39,100     $ 39,100    
Monza Energy, LLC [Member] | JV Drilling Program [Member]              
Joint Venture Working Interest Percentage Contributed to Related Party 88.94%            
Joint Venture Working Interest Percent 11.06%            
Amount Committed by Investors $ 361,400            
Oil and Gas Revenue, Percent 30.00%            
Well Cost, Percent 20.00%            
Capital Contribution Payments from Related Party     $ 184,900        
Capital Contributions from Related Party During Period     70,200        
Capital Contribution Payments to Related Party, Net     57,600        
Monza Energy, LLC [Member] | JV Drilling Program [Member] | Mr. Tracy W. Krohn [Member]              
Capital Commitment to Joint Venture     $ 14,500        
Monza Energy, LLC [Member] | JV Drilling Program [Member] | Maximum [Member]              
Number of Drilling Projects in Drilling Program 14