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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 |  |

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- Definition Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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- Definition The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 + Details
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