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Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 14,128us-gaap_NetIncomeLoss | $ 14,390us-gaap_NetIncomeLoss | $ 12,685us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 21,507us-gaap_DepreciationDepletionAndAmortization | 18,144us-gaap_DepreciationDepletionAndAmortization | 15,707us-gaap_DepreciationDepletionAndAmortization
Deferred taxes | 6,840ngs_DeferredAndOtherIncomeTaxExpenseBenefit | 7,723ngs_DeferredAndOtherIncomeTaxExpenseBenefit | 6,972ngs_DeferredAndOtherIncomeTaxExpenseBenefit
Gain on extinguishment of liability | 0us-gaap_GainsLossesOnExtinguishmentOfDebt | (223)us-gaap_GainsLossesOnExtinguishmentOfDebt | 0us-gaap_GainsLossesOnExtinguishmentOfDebt
Gain on disposal of assets | (160)us-gaap_GainLossOnDispositionOfAssets | (48)us-gaap_GainLossOnDispositionOfAssets | 0us-gaap_GainLossOnDispositionOfAssets
Inventory allowance | 395us-gaap_InventoryWriteDown | 0us-gaap_InventoryWriteDown | 0us-gaap_InventoryWriteDown
Stock based compensation | 3,244us-gaap_ShareBasedCompensation | 1,682us-gaap_ShareBasedCompensation | 1,418us-gaap_ShareBasedCompensation
Changes in current assets (increase) decrease in: |  |  |
Trade accounts receivables | (3,658)us-gaap_IncreaseDecreaseInAccountsReceivable | (59)us-gaap_IncreaseDecreaseInAccountsReceivable | (1,012)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventory | (6,112)us-gaap_IncreaseDecreaseInInventories | (323)us-gaap_IncreaseDecreaseInInventories | 456us-gaap_IncreaseDecreaseInInventories
Prepaid income taxes and prepaid expenses | (3,997)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | (1,870)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | (281)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Changes in current liabilities increase (decrease) in: |  |  |
Accounts payable and accrued liabilities | 1,126us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities | 1,154us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities | 1,863us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Current income tax liability | 920us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | (162)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | 447us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Deferred income | 762us-gaap_IncreaseDecreaseInDeferredRevenue | (1,154)us-gaap_IncreaseDecreaseInDeferredRevenue | (2,836)us-gaap_IncreaseDecreaseInDeferredRevenue
Other | (12)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet | 0us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet | (1)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Tax benefit from equity compensation | (419)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | (10)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | 0us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
NET CASH PROVIDED BY OPERATING ACTIVITIES | 34,564us-gaap_NetCashProvidedByUsedInOperatingActivities | 39,244us-gaap_NetCashProvidedByUsedInOperatingActivities | 35,418us-gaap_NetCashProvidedByUsedInOperatingActivities
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of rental, property and equipment | (53,342)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (43,419)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (23,766)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of property and equipment | 240us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 95us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 5us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
NET CASH USED IN INVESTING ACTIVITIES | (53,102)us-gaap_NetCashProvidedByUsedInInvestingActivities | (43,324)us-gaap_NetCashProvidedByUsedInInvestingActivities | (23,761)us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Payments of other long-term liabilities, net | (42)ngs_ProceedsFromPurchaseCommitmentDiscountNet | (82)ngs_ProceedsFromPurchaseCommitmentDiscountNet | (21)ngs_ProceedsFromPurchaseCommitmentDiscountNet
Repayments of line of credit, net | (160)us-gaap_RepaymentsOfLinesOfCredit | (320)us-gaap_RepaymentsOfLinesOfCredit | (120)us-gaap_RepaymentsOfLinesOfCredit
Tax benefit from equity compensation | 419us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 10us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 0us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Proceeds from exercise of stock options | 59us-gaap_ProceedsFromStockOptionsExercised | 829us-gaap_ProceedsFromStockOptionsExercised | 180us-gaap_ProceedsFromStockOptionsExercised
NET CASH PROVIDED BY FINANCING ACTIVITIES | 276us-gaap_NetCashProvidedByUsedInFinancingActivities | 437us-gaap_NetCashProvidedByUsedInFinancingActivities | 39us-gaap_NetCashProvidedByUsedInFinancingActivities
NET CHANGE IN CASH AND CASH EQUIVALENTS | (18,262)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (3,643)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 11,696us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 24,443us-gaap_CashAndCashEquivalentsAtCarryingValue | 28,086us-gaap_CashAndCashEquivalentsAtCarryingValue | 16,390us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 6,181us-gaap_CashAndCashEquivalentsAtCarryingValue | 24,443us-gaap_CashAndCashEquivalentsAtCarryingValue | 28,086us-gaap_CashAndCashEquivalentsAtCarryingValue
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION: |  |  |
Interest paid | 10us-gaap_InterestPaid | 56us-gaap_InterestPaid | 18us-gaap_InterestPaid
Income taxes paid | 4,108us-gaap_IncomeTaxesPaid | 2,590us-gaap_IncomeTaxesPaid | 267us-gaap_IncomeTaxesPaid
NON-CASH TRANSACTIONS |  |  |
Transfer of rental equipment to inventory | 131ngs_TransferOfRentalEquipmentToInventory | 207ngs_TransferOfRentalEquipmentToInventory | 8,690ngs_TransferOfRentalEquipmentToInventory
Property and equipment purchases included in accounts payable | $ 218us-gaap_CapitalExpendituresIncurredButNotYetPaid | $ 251us-gaap_CapitalExpendituresIncurredButNotYetPaid | $ 31us-gaap_CapitalExpendituresIncurredButNotYetPaid

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