Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.1
Note 6 - Derivative Financial Instruments - Summary of Open Commodity Derivative Contracts (Details)
 3 Months Ended
Mar. 31, 2021
MMBTU
$ / shares
bbl
NYMEX Crude Oil Swap [Member] | Open Crude Oil Derivative Contracts 1 [Member]  
Notional Quantity (Bbls/day) (Barrel of Oil) | bbl 4,000 [1]
Notional Quantity 1,100,000 [1]
Strike Price (in dollars per share) $ 42.06
NYMEX Crude Oil Swap [Member] | Open Crude Oil Derivative Contracts 2 [Member]  
Notional Quantity (Bbls/day) (Barrel of Oil) | bbl 3,000 [1]
Notional Quantity 177,000 [1]
Strike Price (in dollars per share) $ 42.98
NYMEX Crude Oil Swap [Member] | Open Crude Oil Derivative Contracts 3 [Member]  
Notional Quantity (Bbls/day) (Barrel of Oil) | bbl 2,044 [1]
Notional Quantity 188,006 [1]
Strike Price (in dollars per share) $ 42.33
NYMEX Crude Oil Swap [Member] | Open Crude Oil Derivative Contracts 4 [Member]  
Notional Quantity (Bbls/day) (Barrel of Oil) | bbl 1,615 [1]
Notional Quantity 345,638 [1]
Strike Price (in dollars per share) $ 54.53
NYMEX Crude Oil Collar [Member] | Open Crude Oil Derivative Contracts 1 [Member]  
Notional Quantity (Bbls/day) (Barrel of Oil) | bbl 200 [1]
Notional Quantity 55,000 [1]
NYMEX Crude Oil Collar [Member] | Open Crude Oil Derivative Contracts 1 [Member] | Put Option [Member]  
Strike Price (in dollars per share) $ 40.00
NYMEX Crude Oil Collar [Member] | Open Crude Oil Derivative Contracts 1 [Member] | Call Option [Member]  
Strike Price (in dollars per share) $ 54.90
NYMEX Crude Oil Collar [Member] | Open Crude Oil Derivative Contracts 2 [Member]  
Notional Quantity (Bbls/day) (Barrel of Oil) | bbl 2,273 [1]
Notional Quantity 759,237 [1]
NYMEX Crude Oil Collar [Member] | Open Crude Oil Derivative Contracts 2 [Member] | Put Option [Member]  
Strike Price (in dollars per share) $ 38.50
NYMEX Crude Oil Collar [Member] | Open Crude Oil Derivative Contracts 2 [Member] | Call Option [Member]  
Strike Price (in dollars per share) $ 56.65
NYMEX Crude Oil Collar [Member] | Open Crude Oil Derivative Contracts 3 [Member]  
Notional Quantity (Bbls/day) (Barrel of Oil) | bbl 2,000 [1]
Notional Quantity 184,000 [1]
NYMEX Crude Oil Collar [Member] | Open Crude Oil Derivative Contracts 3 [Member] | Put Option [Member]  
Strike Price (in dollars per share) $ 35.00
NYMEX Crude Oil Collar [Member] | Open Crude Oil Derivative Contracts 3 [Member] | Call Option [Member]  
Strike Price (in dollars per share) $ 48.50
NYMEX Crude Oil Collar [Member] | Open Crude Oil Derivative Contracts 4 [Member]  
Notional Quantity (Bbls/day) (Barrel of Oil) | bbl 1,615 [1]
Notional Quantity 345,638 [1]
NYMEX Crude Oil Collar [Member] | Open Crude Oil Derivative Contracts 4 [Member] | Put Option [Member]  
Strike Price (in dollars per share) $ 45.00
NYMEX Crude Oil Collar [Member] | Open Crude Oil Derivative Contracts 4 [Member] | Call Option [Member]  
Strike Price (in dollars per share) $ 62.50
NYMEX Natural Gas Open Swap Contracts [Member] | Natural Gas, Open Swap Contracts, One [Member]  
Notional Quantity 2,750,000 [2]
Strike Price (in dollars per share) $ 2.62
Notional Quantity (MMBtu/day) (Millions of British Thermal Unit) | MMBTU 10,000 [2]
NYMEX Natural Gas Open Swap Contracts [Member] | Natural Gas, Open Swap Contracts, Two [Member]  
Notional Quantity 620,000 [2]
Strike Price (in dollars per share) $ 2.79
Notional Quantity (MMBtu/day) (Millions of British Thermal Unit) | MMBTU 20,000 [2]
NYMEX Natural Gas Open Swap Contracts [Member] | Natural Gas, Open Swap Contracts, Three [Member]  
Notional Quantity 840,000 [2]
Strike Price (in dollars per share) $ 2.79
Notional Quantity (MMBtu/day) (Millions of British Thermal Unit) | MMBTU 30,000 [2]
NYMEX Natural Gas Open Swap Contracts [Member] | Natural Gas, Open Swap Contracts, Four [Member]  
Notional Quantity 970,075 [2]
Strike Price (in dollars per share) $ 2.69
Notional Quantity (MMBtu/day) (Millions of British Thermal Unit) | MMBTU 10,544 [2]
NYMEX Natural Gas Open Swap Contracts [Member] | Natural Gas, Open Swap Contracts, Five [Member]  
Notional Quantity 2,274,311 [2]
Strike Price (in dollars per share) $ 2.44
Notional Quantity (MMBtu/day) (Millions of British Thermal Unit) | MMBTU 10,628 [2]
NYMEX Natural Gas, Open Call Contracts [Member] | Natural Gas, Open Call Contracts [Member]  
Notional Quantity 25,600,000 [2]
Strike Price (in dollars per share) $ 3.00
Notional Quantity (MMBtu/day) (Millions of British Thermal Unit) | MMBTU 40,000 [2]
NYMEX Natural Gas Two Way Collars [Member] | Natural Gas, Open Collar Contracts, One [Member]  
Notional Quantity 8,250,000 [2]
Notional Quantity (MMBtu/day) (Millions of British Thermal Unit) | MMBTU 30,000 [2]
NYMEX Natural Gas Two Way Collars [Member] | Natural Gas, Open Collar Contracts, One [Member] | Put Option [Member]  
Strike Price (in dollars per share) $ 2.18
NYMEX Natural Gas Two Way Collars [Member] | Natural Gas, Open Collar Contracts, One [Member] | Call Option [Member]  
Strike Price (in dollars per share) $ 3.00
NYMEX Natural Gas Two Way Collars [Member] | Natural Gas, Open Collar Contracts, Two [Member]  
Notional Quantity 25,600,000 [2]
Notional Quantity (MMBtu/day) (Millions of British Thermal Unit) | MMBTU 40,000 [2]
NYMEX Natural Gas Two Way Collars [Member] | Natural Gas, Open Collar Contracts, Two [Member] | Put Option [Member]  
Strike Price (in dollars per share) $ 1.83
NYMEX Natural Gas Two Way Collars [Member] | Natural Gas, Open Collar Contracts, Two [Member] | Call Option [Member]  
Strike Price (in dollars per share) $ 3.00
NYMEX Natural Gas Two Way Collars [Member] | Natural Gas, Open Collar Contracts, Three [Member]  
Notional Quantity 1,770,000 [2]
Notional Quantity (MMBtu/day) (Millions of British Thermal Unit) | MMBTU 30,000 [2]
NYMEX Natural Gas Two Way Collars [Member] | Natural Gas, Open Collar Contracts, Three [Member] | Put Option [Member]  
Strike Price (in dollars per share) $ 2.20
NYMEX Natural Gas Two Way Collars [Member] | Natural Gas, Open Collar Contracts, Three [Member] | Call Option [Member]  
Strike Price (in dollars per share) $ 4.50
NYMEX Natural Gas Two Way Collars [Member] | Natural Gas, Open Collar Contracts, Four [Member]  
Notional Quantity 920,000 [2]
Notional Quantity (MMBtu/day) (Millions of British Thermal Unit) | MMBTU 10,000 [2]
NYMEX Natural Gas Two Way Collars [Member] | Natural Gas, Open Collar Contracts, Four [Member] | Put Option [Member]  
Strike Price (in dollars per share) $ 2.25
NYMEX Natural Gas Two Way Collars [Member] | Natural Gas, Open Collar Contracts, Four [Member] | Call Option [Member]  
Strike Price (in dollars per share) $ 3.40
[1] Bbls = Barrels
[2] MMBtu = Million British Thermal Units