Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
CURRENT ASSETS
Cash and cash equivalents	$ 1,585,926	$ 12,741,197
Marketable securities	0	406,134
Accounts receivable
Trade, less allowance for doubtful accounts of $370,909 and $1,978,358, respectively	12,111,026us-gaap_AccountsReceivableNetCurrent	12,305,657us-gaap_AccountsReceivableNetCurrent
Related parties	234,610	146,225
Unbilled gas	7,630,852us-gaap_UnbilledReceivablesCurrent	7,172,062us-gaap_UnbilledReceivablesCurrent
Note receivable, current portion	2,070	1,938
Inventory
Natural gas	5,301,895us-gaap_EnergyRelatedInventory	4,996,065us-gaap_EnergyRelatedInventory
Materials and supplies	2,300,990us-gaap_MaterialsSuppliesAndOther	2,285,722us-gaap_MaterialsSuppliesAndOther
Prepaid income taxes	431,681us-gaap_PrepaidTaxes	727,427us-gaap_PrepaidTaxes
Prepayments and other	986,941us-gaap_PrepaidExpenseCurrent	970,574us-gaap_PrepaidExpenseCurrent
Regulatory assets, current	4,097,822us-gaap_RegulatoryAssetsCurrent	1,209,982us-gaap_RegulatoryAssetsCurrent
Deferred tax asset	635,195us-gaap_DeferredTaxAssetsNetCurrent	1,225,032us-gaap_DeferredTaxAssetsNetCurrent
Assets held for sale	802,436	0
Discontinued operations	11,653,934	12,032,203
Total current assets	47,775,378us-gaap_AssetsCurrent	56,220,218us-gaap_AssetsCurrent
PROPERTY, PLANT, & EQUIPMENT, NET	142,011,085us-gaap_PropertyPlantAndEquipmentNet	124,587,645us-gaap_PropertyPlantAndEquipmentNet
OTHER ASSETS
Notes receivable, less current portion	90,345	93,727
Regulatory assets, non-current	2,055,404us-gaap_RegulatoryAssetsNoncurrent	452,047us-gaap_RegulatoryAssetsNoncurrent
Debt issuance costs, net of amortization	1,079,447us-gaap_UnamortizedDebtIssuanceExpense	1,388,124us-gaap_UnamortizedDebtIssuanceExpense
Goodwill	16,155,672us-gaap_Goodwill	16,267,377us-gaap_Goodwill
Customer relationships, net of amortization	2,927,500	3,230,333
Investment in unconsolidated affiliate	0us-gaap_EquityMethodInvestments	351,724us-gaap_EquityMethodInvestments
Restricted cash	1,897,677	1,137,442
Other assets	11,404us-gaap_OtherAssetsNoncurrent	3,160us-gaap_OtherAssetsNoncurrent
Total other assets	24,217,449us-gaap_OtherAssets	22,923,934us-gaap_OtherAssets
TOTAL ASSETS	214,003,912us-gaap_Assets	203,731,797us-gaap_Assets
CURRENT LIABILITIES
Checks in excess of amounts on deposit	194,524us-gaap_BankOverdrafts	842,443us-gaap_BankOverdrafts
Line of credit	28,760,799us-gaap_LinesOfCreditCurrent	24,529,799us-gaap_LinesOfCreditCurrent
Accounts payable
Trade	14,115,367us-gaap_AccountsPayableTradeCurrent	12,355,605us-gaap_AccountsPayableTradeCurrent
Related parties	170,319	559,933
Notes payable, current portion	542,201us-gaap_NotesPayableCurrent	3,502,190us-gaap_NotesPayableCurrent
Contingent consideration, current	671,638	671,638
Derivative instruments	3,023,271us-gaap_DerivativeLiabilitiesCurrent	0us-gaap_DerivativeLiabilitiesCurrent
Accrued liabilities	4,860,663us-gaap_AccruedLiabilitiesCurrent	5,751,594us-gaap_AccruedLiabilitiesCurrent
Accrued liabilities - related parties	111,133us-gaap_DueToRelatedPartiesCurrent	0us-gaap_DueToRelatedPartiesCurrent
Customer deposits, current	634,090us-gaap_CustomerDepositsCurrent	667,479us-gaap_CustomerDepositsCurrent
Obligation under capital lease, current	188,224us-gaap_CapitalLeaseObligationsCurrent	177,570us-gaap_CapitalLeaseObligationsCurrent
Regulatory liability, current	925,175us-gaap_RegulatoryLiabilityCurrent	793,184us-gaap_RegulatoryLiabilityCurrent
Build-to-suit liability	5,597,287egas_BuildToSuitLiability	0egas_BuildToSuitLiability
Other current liabilities	940,643us-gaap_OtherLiabilitiesCurrent	1,464,646us-gaap_OtherLiabilitiesCurrent
Liabilities held for sale	61,416	0
Discontinued operations	544,432	574,889
Total current liabilities	61,341,182us-gaap_LiabilitiesCurrent	51,890,970us-gaap_LiabilitiesCurrent
LONG-TERM LIABILITIES
Deferred investment tax credits	113,193	134,255
Deferred tax liability	10,538,394	9,055,166
Asset retirement obligation	1,196,518	1,145,052
Customer advances for construction	993,681us-gaap_CustomerAdvancesForConstruction	987,265us-gaap_CustomerAdvancesForConstruction
Regulatory liability, non-current	1,089,850us-gaap_RegulatoryLiabilityNoncurrent	964,462us-gaap_RegulatoryLiabilityNoncurrent
Customer deposits	949,540us-gaap_CustomerDepositsNoncurrent	0us-gaap_CustomerDepositsNoncurrent
Obligation under capital lease, less current	1,674,714	1,862,938
Contingent consideration, less current	75,362	13,362
Total long-term liabilities	16,631,252us-gaap_LiabilitiesNoncurrent	14,162,500us-gaap_LiabilitiesNoncurrent
NOTES PAYABLE, less current portion	39,720,860us-gaap_LongTermNotesPayable	40,198,552us-gaap_LongTermNotesPayable
COMMITMENTS AND CONTINGENCIES (see Note 24)
STOCKHOLDERS' EQUITY
Preferred stock; $0.15 par value; 1,500,000 shares authorized, no shares issued or outstanding	0us-gaap_PreferredStockValue	0us-gaap_PreferredStockValue
Common stock; $0.15 par value; Authorized: 30,000,000 and 15,000,000 shares, respectively; Issued: 10,487,511 and 10,451,678 shares, respectively; Outstanding: 10,487,511 and 10,451,678 shares, respectively	1,573,127us-gaap_CommonStockValue	1,567,752us-gaap_CommonStockValue
Capital in excess of par value	63,826,341	63,468,969
Accumulated other comprehensive income	0	104,909
Retained earnings	30,911,150	32,338,145
Total stockholders' equity	96,310,618us-gaap_StockholdersEquity	97,479,775us-gaap_StockholdersEquity
TOTAL CAPITALIZATION	136,031,478	137,678,327
TOTAL LIABILITIES AND CAPITALIZATION	$ 214,003,912	$ 203,731,797

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This element represents the total consolidated (as applicable) capitalization of the entity which is comprised of its long-term debt and equity instruments. The table may be detailed by subsidiary (legal entity) and include information by type of debt or equity detailed by instrument.

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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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For utilities only, represents the carrying amount of the liability as of the balance sheet date for payments received by a utility from its customers in advance of performing its obligations under terms of its construction agreements.

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The current portion of money or property received from customers which is either to be returned upon satisfactory contract completion or applied to customer receivables in accordance with the terms of the contract or the understandings.

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The noncurrent portion of money or property received from customers that is to be returned upon satisfactory contract completion or as partial prepayment for goods or services to be provided in the future.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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Carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies relating to a source of usable power held for future sale or future use in manufacturing or production process.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.

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Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.

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Amount of obligation due after one year or beyond the normal operating cycle, if longer.

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Amount classified as liabilities attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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The carrying amount of capitalized costs of materials, supplies, and other assets, which are not included in inventory but used in production.

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No definition available.

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An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date more than one year from the balance sheet date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer.

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The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.

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Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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Amount of asset related to consideration paid in advance for income and other taxes that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

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The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period.

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The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

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