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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:    
Net loss $ (788,963)us-gaap_NetIncomeLoss $ (857,293)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 5,572us-gaap_Depreciation 322us-gaap_Depreciation
Amortization of debt discount 39,923us-gaap_AmortizationOfDebtDiscountPremium 41,651us-gaap_AmortizationOfDebtDiscountPremium
Financing costs paid in equity 7,711us-gaap_DebtIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction 37,980us-gaap_DebtIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction
Stock-based compensation expense from options, warrants, and shares issued for services 182,585us-gaap_ShareBasedCompensation 183,953us-gaap_ShareBasedCompensation
Loss on settlement of liabilities, net      
Gain on sale of assets (12,500)us-gaap_GainLossOnDispositionOfAssets1   
Other 6,300us-gaap_OtherNoncashIncomeExpense   
Changes in operating assets and liabilities    
Accounts Receivable (172,285)us-gaap_IncreaseDecreaseInAccountsReceivable   
Prepaid expenses and other current assets 49,966us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 48,982us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable 110,321us-gaap_IncreaseDecreaseInAccountsPayable 11,687us-gaap_IncreaseDecreaseInAccountsPayable
Accrued compensation and related expense 72,580us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities 29,740us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Accrued interest and other liabilities 2,786us-gaap_IncreaseDecreaseInAccruedLiabilities (4,274)us-gaap_IncreaseDecreaseInAccruedLiabilities
Net cash used in operating activities (496,004)us-gaap_NetCashProvidedByUsedInOperatingActivities (507,252)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities    
Proceeds from sale of fixed assets 12,500us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment   
Purchases of fixed assets 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (9,225)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash provided by (used in) investing activities: 12,500us-gaap_NetCashProvidedByUsedInInvestingActivities (9,225)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Proceeds from sale of common stock    700,000us-gaap_ProceedsFromIssuanceOfCommonStock
Proceeds from notes payable, net 400,000us-gaap_ProceedsFromNotesPayable 120,000us-gaap_ProceedsFromNotesPayable
Proceeds from sale of preferred stock 18,501us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock 36,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
Proceeds from warrant exercise    2,000us-gaap_ProceedsFromIssuanceOfWarrants
Principal payments on notes payable    (132,500)us-gaap_RepaymentsOfNotesPayable
Net cash provided by financing activities 418,501us-gaap_NetCashProvidedByUsedInFinancingActivities 725,500us-gaap_NetCashProvidedByUsedInFinancingActivities
Net change in cash and cash equivalents (65,003)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 209,023us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of year 475,135us-gaap_CashAndCashEquivalentsAtCarryingValue 18,346us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of year 410,132us-gaap_CashAndCashEquivalentsAtCarryingValue 227,369us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental cash flow information    
Cash paid for interest    5,647us-gaap_InterestPaid
Cash paid for income taxes      
Noncash investing and financing activities    
Discount (including beneficial conversion feature) on notes payable 400,000npwz_NotesDiscount 14,965npwz_NotesDiscount
Settlement Of Liabilities And Conversion Of Convertible Notes [Member]    
Noncash investing and financing activities    
Shares and Warrants issued in connection with settlement of liabilities and conversion of convertible notes 99,375npwz_StockAndWarrantsIssued
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= npwz_SettlementOfLiabilitiesAndConversionOfConvertibleNotesMember
38,275npwz_StockAndWarrantsIssued
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= npwz_SettlementOfLiabilitiesAndConversionOfConvertibleNotesMember
Asset Purchase Agreement [Member]    
Noncash investing and financing activities    
Shares issued in connection with an Asset Purchase Agreement    $ 120,633us-gaap_StockIssued1
/ us-gaap_RelatedPartyTransactionAxis
= npwz_AssetPurchaseAgreementMember