Annual report pursuant to Section 13 and 15(d)

Schedule I - Parent Company Financial Statement (Condensed Unconsolidated Balance Sheets) (Details)

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Schedule I - Parent Company Financial Statement (Condensed Unconsolidated Balance Sheets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current assets:        
Cash and cash equivalents $ 19,669 $ 20,474 $ 25,357 $ 69,051
Receivables:        
Other 100 120    
Prepayments and other 2,791 4,040    
Total current assets 36,452 38,475    
Equipment and other 9,432 9,779    
Property, plant and equipment, gross, Total 409,367 409,010    
Accumulated depreciation, depletion, and amortization (386,146) (380,991)    
Net property and equipment 23,221 28,019    
Other noncurrent assets:        
Restricted cash 967 918    
Deferred tax asset 1,260      
Total assets 79,633 81,032    
Current liabilities:        
Accounts payable 11,584 19,096    
Accrued liabilities and other 12,991 10,506    
Total current liabilities 46,588 55,554    
Long term debt 2,309 6,940    
Total liabilities 69,344 81,390    
Commitments and contingencies    
VAALCO Energy Inc. shareholders’ equity (deficit):        
Preferred stock, none issued, 500,000 shares authorized, $25 par value    
Common stock, $0.10 par value; 100,000,000 shares authorized, 66,443,971 and 66,109,565 shares issued, 58,862,876 and 58,544,470 shares outstanding 6,644 6,611    
Additional paid-in capital 71,251 70,268    
Less treasury stock, 7,581,095 and 7,555,095 shares at cost (37,953) (37,933)    
Accumulated deficit (29,653) (39,304)    
Total shareholders' equity (deficit) 10,289 (358) $ 26,076 180,463
Total liabilities and shareholders' equity (deficit) 79,633 81,032    
VAALCO ENERGY, INC. [Member]        
Current assets:        
Cash and cash equivalents 576 1,038   $ 3,780
Receivables:        
Other 101 21    
Prepayments and other 599 1,696    
Total current assets 1,276 2,755    
Equipment and other 1,304 1,225    
Property, plant and equipment, gross, Total 1,304 1,225    
Accumulated depreciation, depletion, and amortization (721) (497)    
Net property and equipment 583 728    
Other noncurrent assets:        
Restricted cash 50      
Deferred tax asset 1,260      
Investment in subsidiaries 8,091      
Total assets 11,260 3,483    
Current liabilities:        
Accounts payable 98 310    
Accrued liabilities and other 873 1,024    
Total current liabilities 971 1,334    
Losses in excess of investment in subsidiaries   2,507    
Total liabilities 971 3,841    
VAALCO Energy Inc. shareholders’ equity (deficit):        
Common stock, $0.10 par value; 100,000,000 shares authorized, 66,443,971 and 66,109,565 shares issued, 58,862,876 and 58,544,470 shares outstanding 6,644 6,611    
Additional paid-in capital 71,251 70,268    
Less treasury stock, 7,581,095 and 7,555,095 shares at cost (37,953) (37,933)    
Accumulated deficit (29,653) (39,304)    
Total shareholders' equity (deficit) 10,289 (358)    
Total liabilities and shareholders' equity (deficit) $ 11,260 $ 3,483