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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information [Line Items]        
Revenues-crude oil and natural gas sales $ 18,256,000 $ 17,603,000 $ 54,619,000 $ 62,598,000
Depreciation, depletion and amortization 2,212,000 1,509,000 8,116,000 4,971,000
Impairment of proved crude oil and natural gas properties 0   30,625,000  
Bad debt expense and other 151,000 54,000 1,140,000 30,000
Other operating income (expense), net (37,000) 35,000 (883,000) (4,401,000)
Operating income (loss) 4,678,000 1,501,000 (22,971,000) 13,417,000
Derivative instruments gain, net   2,267,000 6,583,000 2,266,000
Interest income, net       581,000
Other, net 147,000 (138,000) 163,000 (521,000)
Income tax expense (2,759,000) 7,681,000 28,470,000 19,642,000
Additions to crude oil and natural gas properties and equipment - accrual (315,000) 6,112,000 10,296,000 8,419,000
Operating Segments [Member] | Gabon Segment [Member]        
Segment Reporting Information [Line Items]        
Revenues-crude oil and natural gas sales 18,256,000 17,603,000 54,619,000 62,598,000
Depreciation, depletion and amortization 1,946,000 1,437,000 7,790,000 4,751,000
Impairment of proved crude oil and natural gas properties     30,625,000  
Bad debt expense and other     1,140,000  
Other operating income (expense), net     (883,000) (4,436,000)
Operating income (loss) 6,957,000 6,048,000 (17,622,000) 24,541,000
Interest income, net       4,000
Other, net       (333,000)
Income tax expense (2,464,000) 4,774,000 19,302,000 15,134,000
Additions to crude oil and natural gas properties and equipment - accrual (306,000) 6,112,000 10,305,000 8,386,000
Operating Segments [Member] | Equatorial Guinea Segment [Member]        
Segment Reporting Information [Line Items]        
Operating income (loss) (95,000) (54,000) (289,000) (370,000)
Other, net       (4,000)
Income tax expense 1,000   1,000 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 266,000 72,000 326,000 220,000
Other operating income (expense), net       35,000
Operating income (loss) (2,184,000) (4,493,000) (5,060,000) (10,754,000)
Derivative instruments gain, net   2,267,000 6,583,000 2,266,000
Interest income, net       577,000
Other, net       (184,000)
Income tax expense (296,000) $ 2,907,000 9,167,000 4,496,000
Additions to crude oil and natural gas properties and equipment - accrual $ (9,000)   $ (9,000) $ 220,000