$RGCO
RGC RESOURCES INC Stock $rgco

$rgco Overview Financials Valuation SEC Filings Company Website

2017 Q3 Form 10-K Financial Statement

#000106953317000036 Filed on December 08, 2017

Income Statement

Concept	2017 Q3	2017 Q2	2017
Revenue	$10.17M	$11.44M	$62.30M
YoY Change	1.93%	1.25%	5.47%
Cost Of Revenue	$4.220M	$4.800M	$29.50M
YoY Change	2.43%	-3.61%	7.27%
Gross Profit	$5.954M	$6.634M	$32.81M
YoY Change	1.52%	5.1%	3.94%
Gross Profit Margin	58.53%	58.01%	52.67%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$1.590M	$1.590M	$6.378M
YoY Change	8.9%	11.97%	11.71%
% of Gross Profit	26.7%	23.97%	19.44%
Operating Expenses	$4.660M	$5.310M	$20.60M
YoY Change	-7.54%	9.26%	0.98%
Operating Profit	$766.6K	$1.328M	$12.19M
YoY Change	-6.09%	-8.61%	8.75%
Interest Expense	-$390.0K	$472.3K	$1.917M
YoY Change	8.33%	19.18%	17.17%
% of Operating Profit	-50.87%	35.56%	15.72%
Other Income/Expense, Net	-$640.0K	-$8.738K	-$658.9K
YoY Change	255.56%	-77.68%	157.79%
Pretax Income	$270.0K	$958.8K	$10.04M
YoY Change	0.0%	-9.42%	5.97%
Income Tax	$110.0K	$343.2K	$3.805M
% Of Pretax Income	40.74%	35.8%	37.91%
Net Earnings	$159.9K	$615.6K	$6.233M
YoY Change	9.84%	-1.83%	7.34%
Net Earnings / Revenue	1.57%	5.38%	10.01%
Basic Earnings Per Share	$0.02	$0.09	$0.86
Diluted Earnings Per Share	$0.02	$0.08	$0.86
COMMON SHARES
Basic Shares Outstanding	7.232M shares	7.227M shares	7.219M shares
Diluted Shares Outstanding		7.274M shares	7.256M shares

Balance Sheet

Concept	2017 Q3	2017 Q2	2017
SHORT-TERM ASSETS
Cash & Short-Term Investments	$100.0K	$800.0K	$100.0K
YoY Change	-83.33%	-11.11%	-83.33%
Cash & Equivalents	$69.64K	$763.8K	$100.0K
Short-Term Investments
Other Short-Term Assets	$1.577M	$1.273M	$3.400M
YoY Change	1.82%	6.41%	9.68%
Inventory	$8.700M	$6.400M	$8.700M
Prepaid Expenses
Receivables	$3.493M	$4.659M	$3.500M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$15.69M	$13.13M	$15.70M
YoY Change	1.31%	4.45%	1.29%
LONG-TERM ASSETS
Property, Plant & Equipment	$147.9M	$145.0M	$147.9M
YoY Change	11.96%	13.37%	11.96%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$7.400M	$5.700M	$7.400M
YoY Change	111.43%	67.65%	111.43%
Other Assets	$190.1K	$115.7K	$12.10M
YoY Change	67.41%	12.44%	-15.97%
Total Long-Term Assets	$19.52M	$20.44M	$167.4M
YoY Change	8.8%	39.47%	11.53%
TOTAL ASSETS
Total Short-Term Assets	$15.69M	$13.13M	$15.70M
Total Long-Term Assets	$19.52M	$20.44M	$167.4M
Total Assets	$183.1M	$178.5M	$183.1M
YoY Change	10.62%	15.11%	10.57%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$5.123M	$5.731M	$5.100M
YoY Change	-4.17%	13.42%	-3.77%
Accrued Expenses	$3.007M	$2.485M	$3.000M
YoY Change	-5.86%	0.87%	-6.25%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change	-100.0%	-100.0%	-100.0%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$14.37M	$15.72M	$14.40M
YoY Change	-49.59%	-31.65%	-49.47%
LONG-TERM LIABILITIES
Long-Term Debt	$61.31M	$53.08M	$61.30M
YoY Change	82.28%	61.7%	82.44%
Other Long-Term Liabilities	$24.30M	$29.40M	$24.30M
YoY Change	-15.63%	15.75%	-15.63%
Total Long-Term Liabilities	$47.42M	$50.05M	$85.60M
YoY Change	-0.7%	17.18%	37.18%
TOTAL LIABILITIES
Total Short-Term Liabilities	$14.37M	$15.72M	$14.40M
Total Long-Term Liabilities	$47.42M	$50.05M	$85.60M
Total Liabilities	$61.78M	$65.78M	$123.1M
YoY Change	-18.97%	0.09%	12.01%
SHAREHOLDERS EQUITY
Retained Earnings	$24.75M	$25.64M
YoY Change	0.13%	0.39%
Common Stock	$36.50M	$36.34M
YoY Change	9.11%	9.48%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$60.04M	$59.67M	$60.00M
YoY Change
Total Liabilities & Shareholders Equity	$183.1M	$178.5M	$183.1M
YoY Change	10.62%	15.11%	10.57%

Cashflow Statement

Concept	2017 Q3	2017 Q2	2017
OPERATING ACTIVITIES
Net Income	$159.9K	$615.6K	$6.233M
YoY Change	9.84%	-1.83%	7.34%
Depreciation, Depletion And Amortization	$1.590M	$1.590M	$6.378M
YoY Change	8.9%	11.97%	11.71%
Cash From Operating Activities	-$2.770M	$4.110M	$12.98M
YoY Change	346.77%	-11.23%	-13.01%
INVESTING ACTIVITIES
Capital Expenditures	-$4.300M	-$5.050M	$20.75M
YoY Change	-20.22%	14.77%	15.63%
Acquisitions
YoY Change
Other Investing Activities	-$950.0K	-$880.0K	-$2.740M
YoY Change	21.79%	37.5%	-10.16%
Cash From Investing Activities	-$5.250M	-$5.930M	-$23.49M
YoY Change	-14.91%	17.66%	11.89%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$967.7K
YoY Change			-6.16%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	7.330M	2.040M	$9.938M
YoY Change	12.42%	229.03%	73.35%
NET CHANGE
Cash From Operating Activities	-2.770M	4.110M	$12.98M
Cash From Investing Activities	-5.250M	-5.930M	-$23.49M
Cash From Financing Activities	7.330M	2.040M	$9.938M
Net Change In Cash	-690.0K	220.0K	-$573.6K
YoY Change	155.56%	4.76%	67.73%
FREE CASH FLOW
Cash From Operating Activities	-$2.770M	$4.110M	$12.98M
Capital Expenditures	-$4.300M	-$5.050M	$20.75M
Free Cash Flow	$1.530M	$9.160M	-$7.769M
YoY Change	-67.92%	1.44%	156.91%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2017	dei	Amendment Flag AmendmentFlag	false
CY2017	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--09-30
CY2017	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2017	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
CY2017	dei	Document Period End Date DocumentPeriodEndDate	2017-09-30
CY2017	dei	Document Type DocumentType	10-K
CY2017	dei	Entity Central Index Key EntityCentralIndexKey	0001069533
CY2017Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	7250093	shares
CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2017	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2017Q1	dei	Entity Public Float EntityPublicFloat	147136528	USD
CY2017	dei	Entity Registrant Name EntityRegistrantName	RGC RESOURCES INC
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2015	rgco	Accounts Payable Customer Credits And Accrued Expenses Net AccountsPayableCustomerCreditsAndAccruedExpensesNet	-873354	USD
CY2016	rgco	Accounts Payable Customer Credits And Accrued Expenses Net AccountsPayableCustomerCreditsAndAccruedExpensesNet	60303	USD
CY2017	rgco	Accounts Payable Customer Credits And Accrued Expenses Net AccountsPayableCustomerCreditsAndAccruedExpensesNet	-1374713	USD
CY2016Q3	rgco	Accrual Of Estimated Revenues For Natural Gas Delivered To Customers But Not Billed During Period AccrualOfEstimatedRevenuesForNaturalGasDeliveredToCustomersButNotBilledDuringPeriod	1004061	USD
CY2017Q3	rgco	Accrual Of Estimated Revenues For Natural Gas Delivered To Customers But Not Billed During Period AccrualOfEstimatedRevenuesForNaturalGasDeliveredToCustomersButNotBilledDuringPeriod	965683	USD
CY2017Q1	rgco	Adjustments To Retained Earnings Stock Split AdjustmentsToRetainedEarningsStockSplit	2004244	USD
CY2016Q3	rgco	Capital Contributions Payable CapitalContributionsPayable	287794	USD
CY2017Q3	rgco	Capital Contributions Payable CapitalContributionsPayable	1055504	USD
CY2015	rgco	Cost Of Plant Retirement CostOfPlantRetirement	406731	USD
CY2016	rgco	Cost Of Plant Retirement CostOfPlantRetirement	449201	USD
CY2017	rgco	Cost Of Plant Retirement CostOfPlantRetirement	354744	USD
CY2015	rgco	Cost Of Sales CostOfSales	37983174	USD
CY2016	rgco	Cost Of Sales CostOfSales	27498377	USD
CY2017	rgco	Cost Of Sales CostOfSales	29487713	USD
CY2017	rgco	Debt Instrument Debt Covenant Ratioof Longterm Debtto Total Capitalization Maximum DebtInstrumentDebtCovenantRatioofLongtermDebttoTotalCapitalizationMaximum	0.65
CY2017	rgco	Deferred Charges Amortization Period DeferredChargesAmortizationPeriod	P12M
CY2016Q3	rgco	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions And Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionsAndPostretirementBenefits	2532672	USD
CY2017Q3	rgco	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions And Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionsAndPostretirementBenefits	1747429	USD
CY2016Q3	rgco	Deferred Tax Assets Tax Deferred Expense Costs Of Gas Held In Storage DeferredTaxAssetsTaxDeferredExpenseCostsOfGasHeldInStorage	1077849	USD
CY2017Q3	rgco	Deferred Tax Assets Tax Deferred Expense Costs Of Gas Held In Storage DeferredTaxAssetsTaxDeferredExpenseCostsOfGasHeldInStorage	1009206	USD
CY2017Q3	rgco	Defined Benefit Plan Amortization Of Net Gains Losses Regulatory Deferral DefinedBenefitPlanAmortizationOfNetGainsLossesRegulatoryDeferral	659000	USD
CY2017Q3	rgco	Energy Purchase Obligation Due In Next Twelve Months EnergyPurchaseObligationDueInNextTwelveMonths	369828	MMBTU
CY2017Q3	rgco	Energy Purchase Obligation Due Total EnergyPurchaseObligationDueTotal	369828	MMBTU
CY2015	rgco	Increase Decrease In Accounts Receivable Net Of Customer Deposits IncreaseDecreaseInAccountsReceivableNetOfCustomerDeposits	-638917	USD
CY2016	rgco	Increase Decrease In Accounts Receivable Net Of Customer Deposits IncreaseDecreaseInAccountsReceivableNetOfCustomerDeposits	258960	USD
CY2017	rgco	Increase Decrease In Accounts Receivable Net Of Customer Deposits IncreaseDecreaseInAccountsReceivableNetOfCustomerDeposits	191386	USD
CY2016Q3	rgco	Natural Gas Purchases Fair Value Disclosure NaturalGasPurchasesFairValueDisclosure	1052930	USD
CY2017Q3	rgco	Natural Gas Purchases Fair Value Disclosure NaturalGasPurchasesFairValueDisclosure	805159	USD
CY2017Q3	rgco	Number Of Customers NumberOfCustomers	59800	customer
CY2017	rgco	Number Of Pipelines NumberOfPipelines	2	pipeline
CY2015	rgco	Other Comprehensive Income Amortizationof Defined Benefit Plan Recognizedin Net Periodic Pension Cost Tax OtherComprehensiveIncomeAmortizationofDefinedBenefitPlanRecognizedinNetPeriodicPensionCostTax	-22884	USD
CY2016	rgco	Other Comprehensive Income Amortizationof Defined Benefit Plan Recognizedin Net Periodic Pension Cost Tax OtherComprehensiveIncomeAmortizationofDefinedBenefitPlanRecognizedinNetPeriodicPensionCostTax	-84006	USD
CY2017	rgco	Other Comprehensive Income Amortizationof Defined Benefit Plan Recognizedin Net Periodic Pension Cost Tax OtherComprehensiveIncomeAmortizationofDefinedBenefitPlanRecognizedinNetPeriodicPensionCostTax	-97369	USD
CY2015	rgco	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicBenefitCostBeforeTax	-60221	USD
CY2016	rgco	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicBenefitCostBeforeTax	-221070	USD
CY2017	rgco	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Benefit Cost Before Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicBenefitCostBeforeTax	-256234	USD
CY2015	rgco	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Pension Cost Net Of Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicPensionCostNetOfTax	-37337	USD
CY2016	rgco	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Pension Cost Net Of Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicPensionCostNetOfTax	-137064	USD
CY2017	rgco	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Recognized In Net Periodic Pension Cost Net Of Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansRecognizedInNetPeriodicPensionCostNetOfTax	-158865	USD
CY2016Q3	rgco	Public Utilities Property Plant And Equipment In Service Net PublicUtilitiesPropertyPlantAndEquipmentInServiceNet	129420999	USD
CY2017Q3	rgco	Public Utilities Property Plant And Equipment In Service Net PublicUtilitiesPropertyPlantAndEquipmentInServiceNet	144457727	USD
CY2016Q3	rgco	Public Utilities Property Plant And Equipment Liquefied Natural Gas PublicUtilitiesPropertyPlantAndEquipmentLiquefiedNaturalGas	12594294	USD
CY2017Q3	rgco	Public Utilities Property Plant And Equipment Liquefied Natural Gas PublicUtilitiesPropertyPlantAndEquipmentLiquefiedNaturalGas	13299288	USD
CY2015	rgco	Reclassification Between Currentand Deferred Income Taxes ReclassificationBetweenCurrentandDeferredIncomeTaxes	1442211	USD
CY2016	rgco	Reclassification Between Currentand Deferred Income Taxes ReclassificationBetweenCurrentandDeferredIncomeTaxes	1283925	USD
CY2016Q3	rgco	Regulatory Cost Of Retirement Obligations RegulatoryCostOfRetirementObligations	9348443	USD
CY2017Q3	rgco	Regulatory Cost Of Retirement Obligations RegulatoryCostOfRetirementObligations	10055189	USD
CY2017	rgco	Unregulated Cost Of Sales UnregulatedCostOfSales	568088	USD
CY2016Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	5345575	USD
CY2017	rgco	Regulatory Utility Assets Provision Period RegulatoryUtilityAssetsProvisionPeriod	P5Y
CY2017Q1	rgco	Stock Split Effect Common Stock Dividend StockSplitEffectCommonStockDividend	0.50
CY2017	rgco	Twenty Year Treasury Rate Change TwentyYearTreasuryRateChange	0.0064
CY2017	rgco	Unamortized Losson Early Retirementof Debt Amortization Period UnamortizedLossonEarlyRetirementofDebtAmortizationPeriod	P20Y
CY2016Q3	rgco	Unamortizedlossonearlyretirementofdebtdeferredasregulatoryasset Unamortizedlossonearlyretirementofdebtdeferredasregulatoryasset	2055369	USD
CY2017Q3	rgco	Unamortizedlossonearlyretirementofdebtdeferredasregulatoryasset Unamortizedlossonearlyretirementofdebtdeferredasregulatoryasset	1941182	USD
CY2015	rgco	Unregulated Cost Of Sales UnregulatedCostOfSales	545859	USD
CY2016	rgco	Unregulated Cost Of Sales UnregulatedCostOfSales	489047	USD
CY2017Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	5122899	USD
CY2016Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	3478983	USD
CY2017Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	3492703	USD
CY2016Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	3194255	USD
CY2017Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	3006936	USD
CY2014Q3	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	0	USD
CY2015Q3	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	0	USD
CY2016Q3	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	0	USD
CY2017Q3	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	72489	USD
CY2014Q3	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	1139326	USD
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CY2017Q3	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	1274753	USD
CY2014Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1139326	USD
CY2015Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2286545	USD
CY2016Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2497231	USD
CY2017Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1202264	USD
CY2016Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	9509548	USD
CY2017Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	292485	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Stock Issued Issuance Costs AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	96508	USD
CY2017Q1	us-gaap	Adjustments To Additional Paid In Capital Stock Split AdjustmentsToAdditionalPaidInCapitalStockSplit	10025546	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Stock Split AdjustmentsToAdditionalPaidInCapitalStockSplit	0	USD
CY2015	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	11666412	USD
CY2016	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	9114774	USD
CY2017	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	6748113	USD
CY2014Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	70747	USD
CY2015Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	52721	USD
CY2016Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	76934	USD
CY2017Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	99456	USD
CY2015	us-gaap	Allowance For Doubtful Accounts Receivable Recoveries AllowanceForDoubtfulAccountsReceivableRecoveries	139282	USD
CY2016	us-gaap	Allowance For Doubtful Accounts Receivable Recoveries AllowanceForDoubtfulAccountsReceivableRecoveries	137055	USD
CY2017	us-gaap	Allowance For Doubtful Accounts Receivable Recoveries AllowanceForDoubtfulAccountsReceivableRecoveries	110725	USD
CY2015	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	245216	USD
CY2016	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	126916	USD
CY2017	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	172790	USD
CY2015	us-gaap	Asset Management Costs AssetManagementCosts	33405000	USD
CY2016	us-gaap	Asset Management Costs AssetManagementCosts	24852000	USD
CY2017	us-gaap	Asset Management Costs AssetManagementCosts	28496000	USD
CY2016	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	310568	USD
CY2017	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	312503	USD
CY2016	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	85263	USD
CY2017	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	65556	USD
CY2016	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	176090	USD
CY2017	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	137304	USD
CY2016	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	166947	USD
CY2017	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	146682	USD
CY2015Q3	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	5295868	USD
CY2016Q3	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	5682556	USD
CY2017Q3	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	6069993	USD
CY2016Q3	us-gaap	Assets Assets	165552849	USD
CY2017Q3	us-gaap	Assets Assets	183135071	USD
CY2016Q3	us-gaap	Assets Current AssetsCurrent	15482324	USD
CY2017Q3	us-gaap	Assets Current AssetsCurrent	15685604	USD
CY2017Q3	us-gaap	Assets Fair Value Disclosure Recurring AssetsFairValueDisclosureRecurring	116843	USD
CY2016Q3	us-gaap	Assets Noncurrent AssetsNoncurrent	17942387	USD
CY2017Q3	us-gaap	Assets Noncurrent AssetsNoncurrent	19521496	USD
CY2014Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	849757	USD
CY2015Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	985234	USD
CY2016Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	643252	USD
CY2017Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	69640	USD
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	135477	USD
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-341982	USD
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-573612	USD
CY2016Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2017Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2015	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.51
CY2016	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.54
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.58
CY2016Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2017Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5.00
CY2017Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	5
CY2016Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	10000000	shares
CY2017Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	10000000	shares
CY2016Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	7182434	shares
CY2017Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	7240846	shares
CY2016Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	7182434	shares
CY2017Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	7240846	shares
CY2016Q3	us-gaap	Common Stock Value CommonStockValue	23941445	USD
CY2017Q3	us-gaap	Common Stock Value CommonStockValue	36204230	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	3947196	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	5596180	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	7527832	USD
CY2015	us-gaap	Cost Of Natural Gas Purchases CostOfNaturalGasPurchases	37437315	USD
CY2016	us-gaap	Cost Of Natural Gas Purchases CostOfNaturalGasPurchases	27009330	USD
CY2017	us-gaap	Cost Of Natural Gas Purchases CostOfNaturalGasPurchases	28919625	USD
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	379180	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-1216745	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	72368	USD
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	753721	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-800770	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	480011	USD
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	374541	USD
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	415975	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	407643	USD
CY2016Q3	us-gaap	Customer Advances Current CustomerAdvancesCurrent	1605608	USD
CY2017Q3	us-gaap	Customer Advances Current CustomerAdvancesCurrent	1220578	USD
CY2016Q3	us-gaap	Customer Deposits Current CustomerDepositsCurrent	1627105	USD
CY2017Q3	us-gaap	Customer Deposits Current CustomerDepositsCurrent	1471960	USD
CY2016Q3	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	33896200	USD
CY2017Q3	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	61603960	USD
CY2017	us-gaap	Debt Instrument Term DebtInstrumentTerm	P20Y
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	2289729	USD
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	4302906	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	3129925	USD
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	2416841	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	4466954	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	3325379	USD
CY2016Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	24316158	USD
CY2017Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	27829657	USD
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	127112	USD
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	164048	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	195454	USD
CY2016Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	5358304	USD
CY2017Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	4752809	USD
CY2016Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	340121	USD
CY2017Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	348833	USD
CY2016Q3	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	345318	USD
CY2017Q3	us-gaap	Deferred Tax Assets Regulatory Assets And Liabilities DeferredTaxAssetsRegulatoryAssetsAndLiabilities	545894	USD
CY2016Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Compensated Absences DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences	262273	USD
CY2017Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Compensated Absences DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences	239414	USD
CY2016Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Other DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther	770868	USD
CY2017Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Other DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther	824281	USD
CY2016Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	29203	USD
CY2017Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	37752	USD
CY2016Q3	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	40776	USD
CY2017Q3	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	154817	USD
CY2016Q3	us-gaap	Public Utilities Property Plant And Equipment Transmission And Distribution PublicUtilitiesPropertyPlantAndEquipmentTransmissionAndDistribution	160354300	USD
CY2016Q3	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	18957854	USD
CY2017Q3	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	23076848	USD
CY2016Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	11217	USD
CY2017Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	44354	USD
CY2016Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	24264165	USD
CY2017Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	27630486	USD
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1	2385000	USD
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1	121000	USD
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	2961000	USD
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	153000	USD
CY2017Q3	us-gaap	Defined Benefit Plan Expected Amortization Next Fiscal Year DefinedBenefitPlanExpectedAmortizationNextFiscalYear	24000	USD
CY2015	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	338896	USD
CY2016	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	353793	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	361702	USD
CY2015	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	5219893	USD
CY2016	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	5709525	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	6378368	USD
CY2016Q3	us-gaap	Derivative Assets DerivativeAssets	0	USD
CY2017Q3	us-gaap	Derivative Assets DerivativeAssets	116843	USD
CY2016Q3	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	0	USD
CY2017Q3	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	26777	USD
CY2016Q3	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	0	USD
CY2017Q3	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	90066	USD
CY2015	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	3643093	USD
CY2016	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	3865933	USD
CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	4195910	USD
CY2016Q3	us-gaap	Dividends Payable Current DividendsPayableCurrent	970244	USD
CY2017Q3	us-gaap	Dividends Payable Current DividendsPayableCurrent	1050281	USD
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.72
CY2015Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.27
CY2016Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.44
CY2016Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.09
CY2016Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.02
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.81
CY2016Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.31
CY2017Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.45
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.09
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.02
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.86
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.72
CY2015Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.27
CY2016Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.44
CY2016Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.09
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.02
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.81
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.31
CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.45
CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.08
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.02
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.86
CY2015	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.34
CY2016	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.34
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.34
CY2016Q3	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	7436785	USD
CY2017Q3	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	7701894	USD
CY2015	us-gaap	Gross Profit GrossProfit	30206433	USD
CY2015Q4	us-gaap	Gross Profit GrossProfit	8738116	USD
CY2016Q1	us-gaap	Gross Profit GrossProfit	10649269	USD
CY2016Q2	us-gaap	Gross Profit GrossProfit	6312340	USD
CY2016Q3	us-gaap	Gross Profit GrossProfit	5865189	USD
CY2016	us-gaap	Gross Profit GrossProfit	31564914	USD
CY2016Q4	us-gaap	Gross Profit GrossProfit	9390905	USD
CY2017Q1	us-gaap	Gross Profit GrossProfit	10829730	USD
CY2017Q2	us-gaap	Gross Profit GrossProfit	6634402	USD
CY2017Q3	us-gaap	Gross Profit GrossProfit	5954120	USD
CY2017	us-gaap	Gross Profit GrossProfit	32809157	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	8264977	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	9473050	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	10038255	USD
CY2015	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2016	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	152864	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	421646	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3170562	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3666184	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3805390	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	2810092	USD
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	3220837	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	3413007	USD
CY2015	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	29379	USD
CY2016	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	62532	USD
CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-5661	USD
CY2015	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	331091	USD
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	382815	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	398044	USD
CY2015	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1266573	USD
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-907000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	726000	USD
CY2015	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-3168056	USD
CY2016	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-867682	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	462161	USD
CY2015	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	768922	USD
CY2016	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	398864	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	956894	USD
CY2015	us-gaap	Increase Decrease In Over Under Energy Recovery IncreaseDecreaseInOverUnderEnergyRecovery	-2082257	USD
CY2016	us-gaap	Increase Decrease In Over Under Energy Recovery IncreaseDecreaseInOverUnderEnergyRecovery	991739	USD
CY2017	us-gaap	Increase Decrease In Over Under Energy Recovery IncreaseDecreaseInOverUnderEnergyRecovery	-528387	USD
CY2017Q3	us-gaap	Public Utilities Property Plant And Equipment Transmission And Distribution PublicUtilitiesPropertyPlantAndEquipmentTransmissionAndDistribution	177845619	USD
CY2017Q3	us-gaap	Purchase Obligation PurchaseObligation	41833253	USD
CY2015	us-gaap	Interest Expense InterestExpense	1512419	USD
CY2016	us-gaap	Interest Expense InterestExpense	1636321	USD
CY2017	us-gaap	Interest Expense InterestExpense	1917254	USD
CY2015	us-gaap	Interest Paid InterestPaid	1002462	USD
CY2016	us-gaap	Interest Paid InterestPaid	1480665	USD
CY2017	us-gaap	Interest Paid InterestPaid	1734178	USD
CY2016Q3	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	3496404	USD
CY2017Q3	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	7445106	USD
CY2016Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	165552849	USD
CY2017Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	183135071	USD
CY2016Q3	us-gaap	Liabilities Current LiabilitiesCurrent	28497053	USD
CY2017Q3	us-gaap	Liabilities Current LiabilitiesCurrent	14366232	USD
CY2016Q3	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	33896200	USD
CY2017Q3	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	43812200	USD
CY2016Q3	us-gaap	Liabilities Fair Value Disclosure Recurring LiabilitiesFairValueDisclosureRecurring	1052930	USD
CY2017Q3	us-gaap	Liabilities Fair Value Disclosure Recurring LiabilitiesFairValueDisclosureRecurring	805159	USD
CY2016Q3	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	47752673	USD
CY2017Q3	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	47416356	USD
CY2015Q3	us-gaap	Line Of Credit LineOfCredit	9340997	USD
CY2016Q3	us-gaap	Line Of Credit LineOfCredit	14556785	USD
CY2017Q3	us-gaap	Line Of Credit LineOfCredit	17791760	USD
CY2015	us-gaap	Line Of Credit Facility Average Outstanding Amount LineOfCreditFacilityAverageOutstandingAmount	6377040	USD
CY2016	us-gaap	Line Of Credit Facility Average Outstanding Amount LineOfCreditFacilityAverageOutstandingAmount	9620914	USD
CY2017	us-gaap	Line Of Credit Facility Average Outstanding Amount LineOfCreditFacilityAverageOutstandingAmount	10936114	USD
CY2015Q3	us-gaap	Line Of Credit Facility Current Borrowing Capacity LineOfCreditFacilityCurrentBorrowingCapacity	24000000	USD
CY2016Q3	us-gaap	Line Of Credit Facility Current Borrowing Capacity LineOfCreditFacilityCurrentBorrowingCapacity	24000000	USD
CY2017Q3	us-gaap	Line Of Credit Facility Current Borrowing Capacity LineOfCreditFacilityCurrentBorrowingCapacity	21000000	USD
CY2015Q3	us-gaap	Line Of Credit Facility Interest Rate At Period End LineOfCreditFacilityInterestRateAtPeriodEnd	0.0120
CY2016Q3	us-gaap	Line Of Credit Facility Interest Rate At Period End LineOfCreditFacilityInterestRateAtPeriodEnd	0.0153
CY2017Q3	us-gaap	Line Of Credit Facility Interest Rate At Period End LineOfCreditFacilityInterestRateAtPeriodEnd	0.0223
CY2015	us-gaap	Line Of Credit Facility Interest Rate During Period LineOfCreditFacilityInterestRateDuringPeriod	0.0117
CY2016	us-gaap	Line Of Credit Facility Interest Rate During Period LineOfCreditFacilityInterestRateDuringPeriod	0.0140
CY2017	us-gaap	Line Of Credit Facility Interest Rate During Period LineOfCreditFacilityInterestRateDuringPeriod	0.0192
CY2015	us-gaap	Line Of Credit Facility Maximum Monthend Outstanding Amount LineOfCreditFacilityMaximumMonthendOutstandingAmount	17366052	USD
CY2016	us-gaap	Line Of Credit Facility Maximum Monthend Outstanding Amount LineOfCreditFacilityMaximumMonthendOutstandingAmount	15246089	USD
CY2017	us-gaap	Line Of Credit Facility Maximum Monthend Outstanding Amount LineOfCreditFacilityMaximumMonthendOutstandingAmount	17791760	USD
CY2015	us-gaap	Line Of Credit Facility Unused Capacity Commitment Fee Percentage LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage	0.0015
CY2016	us-gaap	Line Of Credit Facility Unused Capacity Commitment Fee Percentage LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage	0.0015
CY2017	us-gaap	Line Of Credit Facility Unused Capacity Commitment Fee Percentage LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage	0.0015
CY2016Q3	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	33896200	USD
CY2017Q3	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	43812200	USD
CY2017Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	30500000	USD
CY2017Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	0	USD
CY2017Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	7000000	USD
CY2017Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	6312200	USD
CY2017Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	0	USD
CY2017Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	17791760	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-23492555	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	16760827	USD
CY2016Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	33636051	USD
CY2017Q3	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	61312011	USD
CY2016Q3	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	0	USD
CY2017Q3	us-gaap	Long Term Line Of Credit LongTermLineOfCredit	17791760	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-2875076	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	5732879	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	9937965	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-13750274	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-20996501	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	14921640	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	12980978	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	5094415	USD
CY2015Q4	us-gaap	Net Income Loss NetIncomeLoss	1922790	USD
CY2016Q1	us-gaap	Net Income Loss NetIncomeLoss	3111447	USD
CY2016Q2	us-gaap	Net Income Loss NetIncomeLoss	627068	USD
CY2016Q3	us-gaap	Net Income Loss NetIncomeLoss	145561	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	5806866	USD
CY2016Q4	us-gaap	Net Income Loss NetIncomeLoss	2232218	USD
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	3225199	USD
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	615562	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	159886	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	6232865	USD
CY2016	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	287794	USD
CY2017	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	767710	USD
CY2017	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	10006192	USD
CY2015Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	3498052	USD
CY2016Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	5444314	USD
CY2016Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	1453350	USD
CY2016Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	816376	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	11212092	USD
CY2016Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	3982275	USD
CY2017Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	5589207	USD
CY2017Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	1328207	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	766620	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	11666309	USD
CY2016Q3	us-gaap	Other Assets Current OtherAssetsCurrent	1548329	USD
CY2017Q3	us-gaap	Other Assets Current OtherAssetsCurrent	1576574	USD
CY2016Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	113532	USD
CY2017Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	190064	USD
CY2015	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	1850352	USD
CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	339817	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentBeforeTaxPortionAttributableToParent	-1971739	USD
CY2015	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	1147219	USD
CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	210686	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-1222478	USD
CY2015	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-1184556	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	1063613	USD
CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-347750	USD
CY2015	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-726017	USD
CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-213137	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	651892	USD
CY2015	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	703133	USD
CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	129131	USD
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	-749261	USD
CY2015	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-1850352	USD
CY2016	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-339817	USD
CY2017	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	2088582	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Before Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax	116843	USD
CY2015	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	0	USD
CY2016	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	72489	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	44354	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1147219	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-210686	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1294967	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-1910573	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-560887	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	1715505	USD
CY2015	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-703133	USD
CY2016	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-129131	USD
CY2017	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	793615	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	116843	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	72489	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	44354	USD
CY2016Q3	us-gaap	Other Inventory OtherInventory	824139	USD
CY2017Q3	us-gaap	Other Inventory OtherInventory	1021191	USD
CY2015	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-105815	USD
CY2016	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-197298	USD
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-203743	USD
CY2015	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-228796	USD
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-255585	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-132446	USD
CY2016Q3	us-gaap	Other Short Term Borrowings OtherShortTermBorrowings	14556785	USD
CY2017Q3	us-gaap	Other Short Term Borrowings OtherShortTermBorrowings	0	USD
CY2015	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2016	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	101619	USD
CY2017	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	64835	USD
CY2015	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	3603424	USD
CY2016	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	3808683	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	4115873	USD
CY2015	us-gaap	Payments To Acquire Additional Interest In Subsidiaries PaymentsToAcquireAdditionalInterestInSubsidiaries	0	USD
CY2016	us-gaap	Payments To Acquire Additional Interest In Subsidiaries PaymentsToAcquireAdditionalInterestInSubsidiaries	3055746	USD
CY2017	us-gaap	Payments To Acquire Additional Interest In Subsidiaries PaymentsToAcquireAdditionalInterestInSubsidiaries	2759346	USD
CY2015	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	13780356	USD
CY2016	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	17945719	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	20750181	USD
CY2016Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	13763820	USD
CY2017Q3	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	8214326	USD
CY2016Q3	us-gaap	Preferred Stock No Par Value PreferredStockNoParValue	0
CY2017Q3	us-gaap	Preferred Stock No Par Value PreferredStockNoParValue	0
CY2016Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2017Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2016Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2017Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2016Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2017Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2016Q3	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2017Q3	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2016Q3	us-gaap	Prepaid Taxes PrepaidTaxes	1550836	USD
CY2017Q3	us-gaap	Prepaid Taxes PrepaidTaxes	1796825	USD
CY2015	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	432401	USD
CY2016	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1031194	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	967698	USD
CY2015	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	0	USD
CY2016	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	3396200	USD
CY2017	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	9916000	USD
CY2015	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	34698924	USD
CY2016	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	38310326	USD
CY2017	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	42569303	USD
CY2015	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	30082	USD
CY2016	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	4964	USD
CY2017	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	16972	USD
CY2015	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	49366	USD
CY2016	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	41762	USD
CY2017	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	142241	USD
CY2015	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	87908	USD
CY2016	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	14074	USD
CY2017	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	84587	USD
CY2016Q3	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	56156287	USD
CY2017Q3	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	59765987	USD
CY2016Q3	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	2707139	USD
CY2017Q3	us-gaap	Public Utilities Property Plant And Equipment Construction Work In Progress PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress	3470244	USD
CY2015	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0325
CY2016	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0325
CY2017	us-gaap	Public Utilities Property Plant And Equipment Disclosure Of Composite Depreciation Rate For Plants In Service PublicUtilitiesPropertyPlantAndEquipmentDisclosureOfCompositeDepreciationRateForPlantsInService	0.0329
CY2016Q3	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	132128138	USD
CY2017Q3	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	147927971	USD
CY2016Q3	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	12628692	USD
CY2017Q3	us-gaap	Public Utilities Property Plant And Equipment Other Property Plant And Equipment PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment	13078807	USD
CY2016Q3	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	185577286	USD
CY2017Q3	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	204223714	USD
CY2017Q3	us-gaap	Purchase Obligation Due In Fifth Year PurchaseObligationDueInFifthYear	4565743	USD
CY2017Q3	us-gaap	Purchase Obligation Due In Fourth Year PurchaseObligationDueInFourthYear	5221751	USD
CY2017Q3	us-gaap	Purchase Obligation Due In Next Twelve Months PurchaseObligationDueInNextTwelveMonths	11232436	USD
CY2017Q3	us-gaap	Purchase Obligation Due In Second Year PurchaseObligationDueInSecondYear	10113115	USD
CY2017Q3	us-gaap	Purchase Obligation Due In Third Year PurchaseObligationDueInThirdYear	7633155	USD
CY2017Q3	us-gaap	Purchase Obligation Due After Fifth Year PurchaseObligationDueAfterFifthYear	3067053	USD
CY2016Q3	us-gaap	Refundable Gas Costs RefundableGasCosts	909687	USD
CY2017Q3	us-gaap	Refundable Gas Costs RefundableGasCosts	1438074	USD
CY2015	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	68189607	USD
CY2015Q4	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	16010056	USD
CY2016Q1	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	21777773	USD
CY2016Q2	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	11295197	USD
CY2016Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	9980265	USD
CY2016	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	59063291	USD
CY2016Q4	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	18788585	USD
CY2017Q1	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	21900013	USD
CY2017Q2	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	11435824	USD
CY2017Q3	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	10172448	USD
CY2017	us-gaap	Regulated And Unregulated Operating Revenue RegulatedAndUnregulatedOperatingRevenue	62296870	USD
CY2015	us-gaap	Regulated Operating Revenue Gas RegulatedOperatingRevenueGas	67094290	USD
CY2016	us-gaap	Regulated Operating Revenue Gas RegulatedOperatingRevenueGas	58079990	USD
CY2017	us-gaap	Regulated Operating Revenue Gas RegulatedOperatingRevenueGas	61252015	USD
CY2016Q3	us-gaap	Regulatory Assets RegulatoryAssets	15328763	USD
CY2017Q3	us-gaap	Regulatory Assets RegulatoryAssets	12715831	USD
CY2016Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	14332451	USD
CY2017Q3	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	11796260	USD
CY2016Q3	us-gaap	Regulatory Liabilities RegulatoryLiabilities	16179380	USD
CY2017Q3	us-gaap	Regulatory Liabilities RegulatoryLiabilities	17778770	USD
CY2017Q3	us-gaap	Remaining Amounts Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided RemainingAmountsOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided	12703886	USD
CY2015	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	34402977	USD
CY2016	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	33094539	USD
CY2017	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	39334328	USD
CY2016Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	24713310	USD
CY2017Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	24746021	USD
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1	P6M
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0411
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0399
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0381
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.3434
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.2878
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.2609
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0198
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0210
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0220
CY2017Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	36000	shares
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	5624	USD
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	8418	USD
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	99929	USD
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	0	shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	0	shares
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	0	shares
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	0	shares
CY2016Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	87300	shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	12000	shares
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	0	shares
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	25500	shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	24000	shares
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	25500	shares
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	3.28
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	2.69
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	2.89
CY2014Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	34840	USD
CY2015Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	43086	USD
CY2016Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	200211	USD
CY2017Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	1448338	USD
CY2014Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	57000	shares
CY2015Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	78600	shares
CY2017Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	101575	shares
CY2014Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	12.65
CY2015Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	13.22
CY2016Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	13.50
CY2017Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	14.31
CY2017Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber	101575	shares
CY2017Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice	14.31
CY2017Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue	1448338	USD
CY2015	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	12.66
CY2016	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	12.65
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	12.67
CY2015	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	0.00
CY2016	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	0.00
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	0.00
CY2015	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	0.00
CY2016	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	13.20
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	0.00
CY2015	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	14.40
CY2016	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	14.15
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	16.37
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod	P10Y
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P7Y
CY2016	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P7Y
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P7Y
CY2014	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P8Y9M
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P8Y4M
CY2016	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P7Y10M
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P7Y7M
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1	P7Y7M
CY2015	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	27780	shares
CY2016	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	66887	shares
CY2017	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	47187	shares
CY2015	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	3900	shares
CY2016	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	3300	shares
CY2017	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	11225	shares
CY2017Q1	us-gaap	Stock Issued During Period Shares Stock Splits StockIssuedDuringPeriodSharesStockSplits	2405958	shares
CY2015	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	383035	USD
CY2016	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	989432	USD
CY2017	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	921965	USD
CY2015	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	83640	USD
CY2016	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	64640	USD
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	73780	USD
CY2015	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	49366	USD
CY2016	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	41762	USD
CY2017	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	142241	USD
CY2015	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	83640	USD
CY2016	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	64640	USD
CY2017	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	73780	USD
CY2014Q3	us-gaap	Stockholders Equity StockholdersEquity	52020847	USD
CY2015Q3	us-gaap	Stockholders Equity StockholdersEquity	52840991	USD
CY2016Q3	us-gaap	Stockholders Equity StockholdersEquity	55667072	USD
CY2017Q3	us-gaap	Stockholders Equity StockholdersEquity	60040472	USD
CY2017Q1	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	1.5
CY2016Q3	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	260149	USD
CY2017Q3	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	291949	USD
CY2015	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	1095317	USD
CY2016	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	983301	USD
CY2017	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	1044855	USD
CY2016Q3	us-gaap	Unsecured Long Term Debt UnsecuredLongTermDebt	33896200	USD
CY2017Q3	us-gaap	Unsecured Long Term Debt UnsecuredLongTermDebt	43812200	USD
CY2015	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	20200241	USD
CY2016	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	20352822	USD
CY2017	us-gaap	Utilities Operating Expense UtilitiesOperatingExpense	21142848	USD
CY2015	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	5106935	USD
CY2016	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	5591610	USD
CY2017	us-gaap	Utilities Operating Expense Depreciation And Amortization UtilitiesOperatingExpenseDepreciationAndAmortization	6256737	USD
CY2015	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	13486885	USD
CY2016	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	13098086	USD
CY2017	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	13100041	USD
CY2015	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	1606421	USD
CY2016	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	1663126	USD
CY2017	us-gaap	Utilities Operating Expense Taxes UtilitiesOperatingExpenseTaxes	1786070	USD
CY2015	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	5199	shares
CY2016	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	9857	shares
CY2017	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	37360	shares
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	7097514	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	7159763	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	7256046	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	7092315	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	7149906	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	7218686	shares
CY2017	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:12px;padding-left:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Business and Credit Concentrations</font><font style="font-family:inherit;font-size:10pt;font-style:italic;">—</font><font style="font-family:inherit;font-size:10pt;">The primary business of the Company is the distribution of natural gas to residential, commercial and industrial customers in its service territories.</font></div><div style="line-height:120%;padding-top:12px;padding-left:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">No</font><font style="font-family:inherit;font-size:10pt;"> sales to individual customers accounted for more than </font><font style="font-family:inherit;font-size:10pt;">5%</font><font style="font-family:inherit;font-size:10pt;"> of total revenue in any period or amounted to more than </font><font style="font-family:inherit;font-size:10pt;">5%</font><font style="font-family:inherit;font-size:10pt;"> of total accounts receivable.</font></div><div style="line-height:120%;padding-top:12px;padding-left:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Roanoke Gas currently holds the only franchises and certificates of public convenience and necessity to distribute natural gas in its service area. These franchises are effective through </font><font style="font-family:inherit;font-size:10pt;">January 1, 2036</font><font style="font-family:inherit;font-size:10pt;">. The Company's current certificates of public convenience and necessity in Virginia are exclusive and are intended for perpetual duration.</font></div><div style="line-height:120%;padding-top:12px;padding-left:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Roanoke Gas is served directly by </font><font style="font-family:inherit;font-size:10pt;">two</font><font style="font-family:inherit;font-size:10pt;"> primary pipelines that provide all of the natural gas supplied to the Company’s customers. Depending upon weather conditions and the level of customer demand, failure of one or both of these transmission pipelines could have a major adverse impact on the Company.</font></div></div>
CY2017	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:12px;padding-left:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of Estimates</font><font style="font-family:inherit;font-size:10pt;">—The preparation of financial statements in conformity with Generally Accepted Accounting Principles in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.</font></div></div>

Files In Submission

Name	View Source	Status
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RGC RESOURCES INC Stock $rgco

2017 Q3 Form 10-K Financial Statement

#000106953317000036 Filed on December 08, 2017

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$RGCO RGC RESOURCES INC Stock $rgco

2017 Q3 Form 10-K Financial Statement

#000106953317000036 Filed on December 08, 2017

Income Statement

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Cashflow Statement

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$RGCO
RGC RESOURCES INC Stock $rgco