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Condensed Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current Assets:    
Cash and cash equivalents $ 8,620us-gaap_CashAndCashEquivalentsAtCarryingValue $ 6,181us-gaap_CashAndCashEquivalentsAtCarryingValue
Trade accounts receivable, net of allowance for doubtful accounts of $670 and $507, respectively 9,629us-gaap_AccountsReceivableNetCurrent 10,408us-gaap_AccountsReceivableNetCurrent
Inventory, net 27,478us-gaap_InventoryNet 32,624us-gaap_InventoryNet
Prepaid income taxes 5,007us-gaap_PrepaidTaxes 6,242us-gaap_PrepaidTaxes
Prepaid expenses and other 426us-gaap_PrepaidExpenseAndOtherAssetsCurrent 472us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 51,160us-gaap_AssetsCurrent 55,927us-gaap_AssetsCurrent
Rental equipment, net of accumulated depreciation of $111,538 and $106,179, respectively 209,807ngs_RentalEquipmentNet 208,292ngs_RentalEquipmentNet
Property and equipment, net of accumulated depreciation of $10,776 and $10,830 respectively 8,802us-gaap_PropertyPlantAndEquipmentOtherNet 7,362us-gaap_PropertyPlantAndEquipmentOtherNet
Goodwill 10,039us-gaap_Goodwill 10,039us-gaap_Goodwill
Intangibles, net of accumulated amortization of $1,288 and $1,257, respectively 1,871us-gaap_IntangibleAssetsNetExcludingGoodwill 1,902us-gaap_IntangibleAssetsNetExcludingGoodwill
Other assets 41us-gaap_OtherAssetsNoncurrent 41us-gaap_OtherAssetsNoncurrent
Total assets 281,720us-gaap_Assets 283,563us-gaap_Assets
Current Liabilities:    
Accounts payable 2,325us-gaap_AccountsPayableCurrent 4,990us-gaap_AccountsPayableCurrent
Accrued liabilities 2,963us-gaap_AccruedLiabilitiesCurrent 6,624us-gaap_AccruedLiabilitiesCurrent
Current income tax liability 1,501us-gaap_AccruedIncomeTaxesCurrent 851us-gaap_AccruedIncomeTaxesCurrent
Deferred income 907us-gaap_DeferredRevenueCurrent 1,635us-gaap_DeferredRevenueCurrent
Total current liabilities 7,696us-gaap_LiabilitiesCurrent 14,100us-gaap_LiabilitiesCurrent
Line of credit, non-current portion 417us-gaap_LongTermLineOfCredit 417us-gaap_LongTermLineOfCredit
Deferred income tax liability 58,895us-gaap_DeferredTaxLiabilitiesNoncurrent 58,304us-gaap_DeferredTaxLiabilitiesNoncurrent
Other long-term liabilities 148us-gaap_OtherLiabilitiesNoncurrent 155us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 67,156us-gaap_Liabilities 72,976us-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; 12,578 and 12,466 shares issued and outstanding, respectively 126us-gaap_CommonStockValue 124us-gaap_CommonStockValue
Additional paid-in capital 95,346us-gaap_AdditionalPaidInCapitalCommonStock 95,065us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 119,092us-gaap_RetainedEarningsAccumulatedDeficit 115,398us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 214,564us-gaap_StockholdersEquity 210,587us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 281,720us-gaap_LiabilitiesAndStockholdersEquity $ 283,563us-gaap_LiabilitiesAndStockholdersEquity