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)
 9 Months Ended
Sep. 30, 2019
bbl
NYMEX Crude Oil Swap [Member] | Open Crude Oil Derivative Contracts 1 [Member]  
Termination Period 1,500
Notional Quantity (Bbls/day) (Barrel of Oil) 366,000 [1]
Notional Quantity (Bbls) 60.8 [1]
NYMEX Crude Oil Swap [Member] | Open Crude Oil Derivative Contracts 2 [Member]  
Termination Period 5,000
Notional Quantity (Bbls/day) (Barrel of Oil) 1,220,000 [1]
Notional Quantity (Bbls) 61 [1]
NYMEX Crude Oil Swap [Member] | Open Crude Oil Derivative Contracts 3 [Member]  
Termination Period 3,500
Notional Quantity (Bbls/day) (Barrel of Oil) 854,000 [1]
Notional Quantity (Bbls) 60.85 [1]
NYMEX Crude Oil Calls [Member] | Long [Member]  
Termination Period 10,000
Notional Quantity (Bbls/day) (Barrel of Oil) 2,440,000 [1]
Notional Quantity (Bbls) 61 [1]
[1] Bbls = Barrels