2.4.0.80608 - Disclosure - Employee Benefit Plans (Details Textual)truefalsefalse1false USDfalsefalse$ThreeMonthsEnded_30Jun2013http://www.sec.gov/CIK0000043350duration2013-04-01T00:00:002013-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$ThreeMonthsEnded_30Jun2012http://www.sec.gov/CIK0000043350duration2012-04-02T00:00:002012-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false USDfalsefalse$Jan_01_2013_Jun_30_2013http://www.sec.gov/CIK0000043350duration2013-01-01T00:00:002013-06-30T00:00:00PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4false USDfalsefalse$SixMonthsEnded_30Jun2012http://www.sec.gov/CIK0000043350duration2012-01-01T00:00:002012-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$5false USDfalsefalse$BalanceAsOf_31Dec2012http://www.sec.gov/CIK0000043350instant2012-12-31T00:00:000001-01-01T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 2egas_EmployeeBenefitPlansTextualAbstractegas_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Employee Benefit Plans (Textual) [Abstract]2false 3us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsetruefalse00falsefalsefalse2falsetruefalse00falsefalsefalse3truetruefalse0.030.03falsefalsefalse4falsetruefalse00falsefalsefalse5falsetruefalse00falsefalsefalsenum:percentItemTypepurePercentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.No definition available.false0Annual contribution of employees salaries3false 3egas_DiscretionaryContributionsMadeByEmployerToDefinedContributionPlanPercentageegas_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsetruefalse00falsefalsefalse2falsetruefalse00falsefalsefalse3truetruefalse0.030.03falsefalsefalse4falsetruefalse00falsefalsefalse5falsetruefalse00falsefalsefalsenum:percentItemTypepureDiscretionary contributions made by an employer to a defined contribution plan.No definition available.false0Discretionary contributions made by an employer to a defined contribution plan4false 3us-gaap_DefinedContributionPlanCostRecognizedus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse104269104269USD$falsetruefalse2truefalsefalse115090115090USD$falsetruefalse3truefalsefalse197517197517USD$falsetruefalse4truefalsefalse236760236760USD$falsetruefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe amount of the cost recognized during the period for defined contribution plans.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 false2Expense related to plan5false 3us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatchus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsetruefalse00falsefalsefalse2falsetruefalse00falsefalsefalse3truetruefalse0.100.10falsefalsefalse4falsetruefalse00falsefalsefalse5falsetruefalse00falsefalsefalsenum:percentItemTypepurePercentage employer matches of the employee's percentage contribution matched.No definition available.false0Company makes matching contributions in form of common stock, percent6false 3us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlanus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse1341813418falsefalsefalse2truefalsefalse1159811598falsefalsefalse3truefalsefalse2743727437falsefalsefalse4truefalsefalse2087320873falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryValue of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.No definition available.false2Company makes matching contributions in form of common stock7false 3us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlanus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse00falsefalsefalse4truefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryAggregate value of stock issued during the period as a result of employee stock ownership plan (ESOP).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6418455&loc=d3e16649-113920 false2Contribution to ESOP by company8false 3egas_MaximumAgeCriteriaForRetireesToRemainOnSameMedicalPlanToRetainCoverageegas_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse0065 yearsfalsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:durationItemTypenaMaximum age criteria for retirees to remain on the same medical plan to retain coverage.No definition available.false0Maximum age criteria for retirees to remain on the same medical plan to retain coverage9false 3egas_DefinedPostretirementHealthAndLifePensionPerMonthegas_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse125125falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryDefined postretirement health and life pension per month.No definition available.false2Defined postretirement health benefit plan10false 3egas_MinimumAgeCriteriaForRetireesToRemainOnSameMedicalPlanToRetainCoverageegas_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse0060 yearsfalsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:durationItemTypenaMinimum age criteria for retirees to remain on the same medical plan to retain coverage.No definition available.false0Minimum age criteria for retirees to remain on the same medical plan to retain coverage11false 3egas_PercentageRateOfContributionRetireesHealthPlanegas_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsetruefalse00falsefalsefalse2falsetruefalse00falsefalsefalse3truetruefalse1.251.25falsefalsefalse4falsetruefalse00falsefalsefalse5falsetruefalse00falsefalsefalsenum:percentItemTypepurePercentage rate of contribution retirees health plan.No definition available.false0Percentage rate of contribution retirees health plan12false 3us-gaap_DefinedBenefitPlanFairValueOfPlanAssetsus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse156945156945USD$falsetruefalse2falsefalsefalse00falsefalsefalse3truefalsefalse156945156945USD$falsetruefalse4falsefalsefalse00falsefalsefalse5truefalsefalse163313163313USD$falsetruefalsexbrli:monetaryItemTypemonetaryAssets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 false2Value of plan assetsfalseEmployee Benefit Plans (Details Textual) (USD $)NoRoundingUnKnownUnKnownUnKnowntruefalsefalseSheethttp://ewst.com/role/EmployeeBenefitPlansDetailsTextual512