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Income Taxes - Summary of Income Tax Expense from Continuing Operations (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current income tax expense (benefit):      
Federal $ 49,270us-gaap_CurrentFederalTaxExpenseBenefit $ (344,342)us-gaap_CurrentFederalTaxExpenseBenefit $ (150,224)us-gaap_CurrentFederalTaxExpenseBenefit
State 10,961us-gaap_CurrentStateAndLocalTaxExpenseBenefit 120,753us-gaap_CurrentStateAndLocalTaxExpenseBenefit 245,483us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current income tax expense (benefit) 60,231us-gaap_CurrentIncomeTaxExpenseBenefit (223,589)us-gaap_CurrentIncomeTaxExpenseBenefit 95,259us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax expense:      
Federal 1,987,409us-gaap_DeferredFederalIncomeTaxExpenseBenefit 3,692,413us-gaap_DeferredFederalIncomeTaxExpenseBenefit 2,030,525us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State 138,414us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (200,217)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 252,403us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred income tax expense 2,125,823egas_DeferredIncomeTaxExpenseBenefitContinuingAndDiscontinued 3,492,196egas_DeferredIncomeTaxExpenseBenefitContinuingAndDiscontinued 2,282,928egas_DeferredIncomeTaxExpenseBenefitContinuingAndDiscontinued
Total income taxes before credits 2,186,054egas_IncomeTaxExpenseBenefitBeforeInvestmentTaxCredit 3,268,607egas_IncomeTaxExpenseBenefitBeforeInvestmentTaxCredit 2,378,187egas_IncomeTaxExpenseBenefitBeforeInvestmentTaxCredit
Investment tax credit, net (21,062)us-gaap_InvestmentTaxCredit (21,062)us-gaap_InvestmentTaxCredit (21,062)us-gaap_InvestmentTaxCredit
Total income tax expense 2,164,992egas_IncomeTaxExpenseBenefitNet 3,247,545egas_IncomeTaxExpenseBenefitNet 2,357,125egas_IncomeTaxExpenseBenefitNet
Income tax expense from discontinued operations (617,410)egas_IncomeTaxExpenseBenefitDiscontinuedOperation (223,834)egas_IncomeTaxExpenseBenefitDiscontinuedOperation (400,326)egas_IncomeTaxExpenseBenefitDiscontinuedOperation
Income tax expense from continuing operations $ 1,547,582us-gaap_IncomeTaxExpenseBenefit $ 3,023,711us-gaap_IncomeTaxExpenseBenefit $ 1,956,799us-gaap_IncomeTaxExpenseBenefit