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Summary of Significant Accounting Policies (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 segment | Dec. 31, 2013 | Dec. 31, 2012
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cash equivalents, qualification, maximum original maturity of short-term investments |  |  |  |  |  |  |  |  | 3 months |  |
Customer deposit requirements, large custom contracts, maximum percentage |  |  |  |  |  |  |  |  | 50.00%ngs_CustomerDepositsDepositRequirementsLargeCustomContractsMaximumPercentage |  |
Allowance for doubtful accounts | $ 507,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |  |  |  | $ 436,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |  |  |  | $ 507,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 436,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |
Inventory valuation reserves, deductions |  |  |  |  |  |  |  |  | 225,000ngs_InventoryValuationReservesDeductions | 128,000ngs_InventoryValuationReservesDeductions |
Raw materials | 25,984,000us-gaap_InventoryRawMaterialsNetOfReserves |  |  |  | 20,524,000us-gaap_InventoryRawMaterialsNetOfReserves |  |  |  | 25,984,000us-gaap_InventoryRawMaterialsNetOfReserves | 20,524,000us-gaap_InventoryRawMaterialsNetOfReserves |
Work in process | 6,640,000us-gaap_InventoryWorkInProcessNetOfReserves |  |  |  | 6,308,000us-gaap_InventoryWorkInProcessNetOfReserves |  |  |  | 6,640,000us-gaap_InventoryWorkInProcessNetOfReserves | 6,308,000us-gaap_InventoryWorkInProcessNetOfReserves |
Inventory, net | 32,624,000us-gaap_InventoryNet |  |  |  | 26,832,000us-gaap_InventoryNet |  |  |  | 32,624,000us-gaap_InventoryNet | 26,832,000us-gaap_InventoryNet |
Product warranty reserves | 0us-gaap_ProductWarrantyAccrual |  |  |  | 28,000us-gaap_ProductWarrantyAccrual |  |  |  | 0us-gaap_ProductWarrantyAccrual | 28,000us-gaap_ProductWarrantyAccrual |
Anti-dilutive securities |  |  |  |  |  |  |  |  | 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Impairment of goodwill |  |  |  |  |  |  |  |  | 0us-gaap_GoodwillImpairmentLoss | 0us-gaap_GoodwillImpairmentLoss |
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income | 4,004,000us-gaap_NetIncomeLoss | 3,883,000us-gaap_NetIncomeLoss | 3,385,000us-gaap_NetIncomeLoss | 2,856,000us-gaap_NetIncomeLoss | 3,158,000us-gaap_NetIncomeLoss | 3,394,000us-gaap_NetIncomeLoss | 3,844,000us-gaap_NetIncomeLoss | 3,994,000us-gaap_NetIncomeLoss | 14,128,000us-gaap_NetIncomeLoss | 14,390,000us-gaap_NetIncomeLoss | 12,685,000us-gaap_NetIncomeLoss
Denominator for basic net income per common share: |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 12,434,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 12,324,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 12,220,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Denominator for diluted net income per share: |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 12,434,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 12,324,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 12,220,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of stock options and restricted shares (in shares) |  |  |  |  |  |  |  |  | 287,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 226,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 100,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average common shares outstanding, Diluted (in shares) |  |  |  |  |  |  |  |  | 12,721,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 12,550,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 12,320,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.32us-gaap_EarningsPerShareBasic | $ 0.31us-gaap_EarningsPerShareBasic | $ 0.27us-gaap_EarningsPerShareBasic | $ 0.23us-gaap_EarningsPerShareBasic | $ 0.25us-gaap_EarningsPerShareBasic | $ 0.28us-gaap_EarningsPerShareBasic | $ 0.31us-gaap_EarningsPerShareBasic | $ 0.33us-gaap_EarningsPerShareBasic | $ 1.14us-gaap_EarningsPerShareBasic | $ 1.17us-gaap_EarningsPerShareBasic | $ 1.04us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) | $ 0.32us-gaap_EarningsPerShareDiluted | $ 0.30us-gaap_EarningsPerShareDiluted | $ 0.27us-gaap_EarningsPerShareDiluted | $ 0.23us-gaap_EarningsPerShareDiluted | $ 0.25us-gaap_EarningsPerShareDiluted | $ 0.27us-gaap_EarningsPerShareDiluted | $ 0.31us-gaap_EarningsPerShareDiluted | $ 0.32us-gaap_EarningsPerShareDiluted | $ 1.11us-gaap_EarningsPerShareDiluted | $ 1.15us-gaap_EarningsPerShareDiluted | $ 1.03us-gaap_EarningsPerShareDiluted
Uncertain tax positions | $ 0us-gaap_LiabilityForUncertainTaxPositionsCurrent |  |  |  | $ 0us-gaap_LiabilityForUncertainTaxPositionsCurrent |  |  |  | $ 0us-gaap_LiabilityForUncertainTaxPositionsCurrent | $ 0us-gaap_LiabilityForUncertainTaxPositionsCurrent |
Number of business segments |  |  |  |  |  |  |  |  | 1us-gaap_NumberOfOperatingSegments |  |

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