Quarterly report pursuant to Section 13 or 15(d)

Segment Information (Segment Activity) (Details)

v3.20.2
Segment Information (Segment Activity) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting Information [Line Items]        
Revenues-crude oil and natural gas sales $ 17,974,000 $ 25,230,000 $ 36,363,000 $ 44,995,000
Depreciation, depletion and amortization 2,801,000 1,909,000 5,904,000 3,462,000
Impairment of proved crude oil and natural gas properties 0   30,625,000  
Bad debt recovery and other 179,000 5,000 989,000 (24,000)
Other operating expense, net (815,000) (4,399,000) (846,000) (4,436,000)
Operating income (loss) (966,000) 6,370,000 (27,649,000) 11,916,000
Derivative instruments gain (loss), net (756,000) 1,911,000 6,583,000 (1,000)
Income tax expense (2,249,000) 9,208,000 31,229,000 11,961,000
Additions to crude oil and natural gas properties and equipment - accrual 1,190,000 1,622,000 10,611,000 2,307,000
Operating Segments [Member] | Gabon Segment [Member]        
Segment Reporting Information [Line Items]        
Revenues-crude oil and natural gas sales 17,974,000 25,230,000 36,363,000 44,995,000
Depreciation, depletion and amortization 2,772,000 1,835,000 5,844,000 3,314,000
Impairment of proved crude oil and natural gas properties     30,625,000  
Bad debt recovery and other     989,000 (24,000)
Other operating expense, net (815,000) (4,399,000) (846,000) (4,436,000)
Operating income (loss) 1,704,000 8,963,000 (24,579,000) 18,493,000
Income tax expense (273,000) 7,869,000 21,766,000 10,360,000
Additions to crude oil and natural gas properties and equipment - accrual 1,190,000 1,593,000 10,611,000 2,274,000
Operating Segments [Member] | Equatorial Guinea Segment [Member]        
Segment Reporting Information [Line Items]        
Operating income (loss) (69,000) (130,000) (194,000) (316,000)
Income tax expense   2,000   12,000
Additions to crude oil and natural gas properties and equipment - accrual       (187,000)
Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
Depreciation, depletion and amortization 29,000 74,000 60,000 148,000
Operating income (loss) (2,601,000) (2,463,000) (2,876,000) (6,261,000)
Derivative instruments gain (loss), net (756,000) 1,911,000 6,583,000 (1,000)
Income tax expense $ (1,976,000) 1,337,000 $ 9,463,000 1,589,000
Additions to crude oil and natural gas properties and equipment - accrual   $ 29,000   $ 220,000