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Note 12 - Income Taxes (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 12 - Income Taxes (Details) [Line Items]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Deferred Tax Assets, Valuation Allowance $ 20,000,000us-gaap_DeferredTaxAssetsValuationAllowance $ 22,000,000us-gaap_DeferredTaxAssetsValuationAllowance  
Unrecognized Tax Benefits 0us-gaap_UnrecognizedTaxBenefits 0us-gaap_UnrecognizedTaxBenefits  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense  
Related to Net Operating Losses [Member]      
Note 12 - Income Taxes (Details) [Line Items]      
Deferred Tax Assets, Valuation Allowance 1,000,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= gas_RelatedToNetOperatingLossesMember
3,000,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= gas_RelatedToNetOperatingLossesMember
 
Related to Investment in Triton [Member]      
Note 12 - Income Taxes (Details) [Line Items]      
Deferred Tax Assets, Valuation Allowance $ 19,000,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= gas_RelatedToInvestmentInTritonMember
$ 19,000,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= gas_RelatedToInvestmentInTritonMember