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Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current Assets:    
Cash and cash equivalents $ 6,181us-gaap_CashAndCashEquivalentsAtCarryingValue $ 24,443us-gaap_CashAndCashEquivalentsAtCarryingValue
Trade accounts receivable, net of allowance for doubtful accounts of $507 and $436, respectively 10,408us-gaap_AccountsReceivableNetCurrent 6,750us-gaap_AccountsReceivableNetCurrent
Inventory, net of allowance for obsolescence of $225 and $128, respectively 32,624us-gaap_InventoryNet 26,832us-gaap_InventoryNet
Prepaid income taxes 6,242us-gaap_PrepaidTaxes 2,281us-gaap_PrepaidTaxes
Prepaid expenses and other 472us-gaap_PrepaidExpenseAndOtherAssetsCurrent 339us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 55,927us-gaap_AssetsCurrent 60,645us-gaap_AssetsCurrent
Rental equipment, net of accumulated depreciation of $106,179 and $86,533, respectively 208,292ngs_RentalEquipmentNet 176,420ngs_RentalEquipmentNet
Property and equipment, net of accumulated depreciation of $10,830 and $9,692 respectively 7,362us-gaap_PropertyPlantAndEquipmentOtherNet 7,429us-gaap_PropertyPlantAndEquipmentOtherNet
Goodwill 10,039us-gaap_Goodwill 10,039us-gaap_Goodwill
Intangibles, net of accumulated amortization of $1,257 and $1,132, respectively 1,902us-gaap_IntangibleAssetsNetExcludingGoodwill 2,027us-gaap_IntangibleAssetsNetExcludingGoodwill
Other assets 41us-gaap_OtherAssetsNoncurrent 29us-gaap_OtherAssetsNoncurrent
Total assets 283,563us-gaap_Assets 256,589us-gaap_Assets
Current Liabilities:    
Line of credit 0us-gaap_LinesOfCreditCurrent 577us-gaap_LinesOfCreditCurrent
Accounts payable 4,990us-gaap_AccountsPayableCurrent 3,904us-gaap_AccountsPayableCurrent
Accrued liabilities 6,624us-gaap_AccruedLiabilitiesCurrent 6,487us-gaap_AccruedLiabilitiesCurrent
Current income tax liability 851us-gaap_AccruedIncomeTaxesCurrent 350us-gaap_AccruedIncomeTaxesCurrent
Deferred income 1,635us-gaap_DeferredRevenueCurrent 873us-gaap_DeferredRevenueCurrent
Total current liabilities 14,100us-gaap_LiabilitiesCurrent 12,191us-gaap_LiabilitiesCurrent
Line of credit, non-current 417us-gaap_LongTermLineOfCredit 0us-gaap_LongTermLineOfCredit
Deferred income tax liability 58,304us-gaap_DeferredTaxLiabilitiesNoncurrent 51,464us-gaap_DeferredTaxLiabilitiesNoncurrent
Other long-term liabilities 155us-gaap_OtherLiabilitiesNoncurrent 197us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 72,976us-gaap_Liabilities 63,852us-gaap_Liabilities
Commitments and contingencies      
Stockholders’ Equity:    
Preferred stock, 5,000 shares authorized, no shares issued or outstanding 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, 30,000 shares authorized, par value $0.01; 12,466 and 12,366 shares issued and outstanding, respectively 124us-gaap_CommonStockValue 123us-gaap_CommonStockValue
Additional paid-in capital 95,065us-gaap_AdditionalPaidInCapitalCommonStock 91,344us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 115,398us-gaap_RetainedEarningsAccumulatedDeficit 101,270us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 210,587us-gaap_StockholdersEquity 192,737us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 283,563us-gaap_LiabilitiesAndStockholdersEquity $ 256,589us-gaap_LiabilitiesAndStockholdersEquity