Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Derivative Financial Instruments - Summary of Open Commodity Derivative Contracts (Details)

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Note 6 - Derivative Financial Instruments - Summary of Open Commodity Derivative Contracts (Details)
 3 Months Ended
Mar. 31, 2020
$ / shares
bbl
Period May 2020 - Dec. 2022
Notional Quantity (Barrel of Oil) | bbl 40,000 [1]
Notional Quantity 39,000,000 [1]
Weighted Average Strike Price (in dollars per share) $ 3
Period May 2020 - Dec. 2022
Notional Quantity (Barrel of Oil) | bbl 40,000 [1]
Notional Quantity 39,000,000 [1]
Strike Price (in dollars per share) $ 3
NYMEX Crude Oil Swap [Member] | Open Crude Oil Derivative Contracts 1 [Member]  
Period Apr 2020 - May 2020
Notional Quantity (Barrel of Oil) | bbl 10,000 [2]
Notional Quantity 610,000 [2]
Weighted Average Strike Price (in dollars per share) $ 60.92
Period Apr 2020 - May 2020
Notional Quantity (Barrel of Oil) | bbl 10,000 [2]
Notional Quantity 610,000 [2]
Strike Price (in dollars per share) $ 60.92
NYMEX Crude Oil Calls [Member] | Open Crude Oil Derivative Contracts 1 [Member]  
Period Apr 2020 - May 2020
Notional Quantity (Barrel of Oil) | bbl 10,000 [2]
Notional Quantity 610,000 [2]
Weighted Average Strike Price (in dollars per share) $ 61
Period Apr 2020 - May 2020
Notional Quantity (Barrel of Oil) | bbl 10,000 [2]
Notional Quantity 610,000 [2]
Strike Price (in dollars per share) $ 61
NYMEX Crude Oil Calls [Member] | Open Crude Oil Derivative Contracts 2 [Member]  
Period June 2020 - Dec. 2020
Notional Quantity (Barrel of Oil) | bbl 10,000 [2]
Notional Quantity 2,140,000 [2]
Weighted Average Strike Price (in dollars per share) $ 67.50
Period June 2020 - Dec. 2020
Notional Quantity (Barrel of Oil) | bbl 10,000 [2]
Notional Quantity 2,140,000 [2]
Strike Price (in dollars per share) $ 67.50
NYMEX Crude Oil Collar [Member] | Crude Oil, Open Collar Contracts [Member]  
Period June 2020 - Dec. 2020
Notional Quantity (Barrel of Oil) | bbl 10,000 [2]
Notional Quantity 2,140,000 [2]
Period June 2020 - Dec. 2020
Notional Quantity (Barrel of Oil) | bbl 10,000 [2]
Notional Quantity 2,140,000 [2]
NYMEX Crude Oil Collar [Member] | Crude Oil, Open Collar Contracts [Member] | Put Option [Member]  
Weighted Average Strike Price (in dollars per share) $ 45
Strike Price (in dollars per share) 45
NYMEX Crude Oil Collar [Member] | Crude Oil, Open Collar Contracts [Member] | Call Option [Member]  
Weighted Average Strike Price (in dollars per share) 63.51
Strike Price (in dollars per share) $ 63.51
NYMEX Natural Gas Two Way Collars [Member] | Natural Gas, Open Collar Contracts, One [Member]  
Period May 2020 - Dec. 2022
Notional Quantity (Barrel of Oil) | bbl 40,000 [1]
Notional Quantity 39,000,000 [1]
Period May 2020 - Dec. 2022
Notional Quantity (Barrel of Oil) | bbl 40,000 [1]
Notional Quantity 39,000,000 [1]
NYMEX Natural Gas Two Way Collars [Member] | Natural Gas, Open Collar Contracts, One [Member] | Put Option [Member]  
Weighted Average Strike Price (in dollars per share) $ 1.83
Strike Price (in dollars per share) 1.83
NYMEX Natural Gas Two Way Collars [Member] | Natural Gas, Open Collar Contracts, One [Member] | Call Option [Member]  
Weighted Average Strike Price (in dollars per share) 3
Strike Price (in dollars per share) $ 3
[1] MMBtu = Million British Thermal Units
[2] Bbls = Barrels