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
Jun. 30, 2019
$ / bbl
bbl
NYMEX Crude Oil Swap [Member] | Open Crude Oil Derivative Contracts 1 [Member]  
Termination Period May 2020
Notional Quantity (Bbls/day) (Barrel of Oil) | bbl 1,500 [1]
Notional Quantity (Bbls) 504,000 [1]
Strike Price | $ / bbl 60.80
NYMEX Crude Oil Swap [Member] | Open Crude Oil Derivative Contracts 2 [Member]  
Termination Period May 2020
Notional Quantity (Bbls/day) (Barrel of Oil) | bbl 5,000 [1]
Notional Quantity (Bbls) 1,680,000 [1]
Strike Price | $ / bbl 61.00
NYMEX Crude Oil Swap [Member] | Open Crude Oil Derivative Contracts 3 [Member]  
Termination Period May 2020
Notional Quantity (Bbls/day) (Barrel of Oil) | bbl 3,500 [1]
Notional Quantity (Bbls) 1,176,000 [1]
Strike Price | $ / bbl 60.85
NYMEX Crude Oil Calls [Member] | Long [Member]  
Termination Period May 2020
Notional Quantity (Bbls/day) (Barrel of Oil) | bbl 10,000 [1]
Notional Quantity (Bbls) 3,360,000 [1]
Strike Price | $ / bbl 61.00
[1] Bbls = Barrels