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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES    
Net Income $ 880,017us-gaap_NetIncomeLoss $ 787,376us-gaap_NetIncomeLoss
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:    
Depreciation 2,024,860us-gaap_Depreciation 2,004,940us-gaap_Depreciation
Amortization 5,292us-gaap_AdjustmentForAmortization 5,291us-gaap_AdjustmentForAmortization
Compensation on Stock-Based Awards 29,927us-gaap_ShareBasedCompensation 12,841us-gaap_ShareBasedCompensation
Compensation on Equity Appreciation Rights 178,566nsys_EquityAppreciationRights  
Impairment on Assets Held for Sale   74,003us-gaap_AssetImpairmentCharges
Deferred Taxes 114,000us-gaap_DeferredIncomeTaxExpenseBenefit 229,000us-gaap_DeferredIncomeTaxExpenseBenefit
(Gain) Loss on Disposal of Property and Equipment 2,331us-gaap_GainLossOnSaleOfPropertyPlantEquipment (1,357)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Changes in Current Operating Items:    
Accounts Receivable (1,336,820)us-gaap_IncreaseDecreaseInAccountsReceivable (2,422,915)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (1,100,948)us-gaap_IncreaseDecreaseInInventories 237,392us-gaap_IncreaseDecreaseInInventories
Prepaid Expenses (182,425)us-gaap_IncreaseDecreaseInPrepaidExpense (72,774)us-gaap_IncreaseDecreaseInPrepaidExpense
Income Taxes Receivable (325,062)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable (140,174)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Income Taxes Payable   (60,878)us-gaap_IncreaseDecreaseInIncomeTaxes
Accounts Payable 1,121,716us-gaap_IncreaseDecreaseInAccountsPayable (1,137,447)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued Payroll and Commissions 301,164us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities 629,736us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Other Accrued Liabilities (131,788)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities 130,905us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Net Cash Provided by Operating Activities 1,580,830us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 275,939us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
CASH FLOWS FROM INVESTING ACTIVITIES    
Proceeds from Sale of Property and Equipment 250us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 57,160us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Purchases of Property and Equipment (2,187,161)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,204,681)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net Cash Used in Investing Activities (2,186,911)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (1,147,521)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
CASH FLOWS FROM FINANCING ACTIVITIES    
Net Proceeds from (Repayments on) Line of Credit 763,201us-gaap_ProceedsFromRepaymentsOfLinesOfCredit (688,504)us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
Proceeds from Long-Term Debt 593,000us-gaap_ProceedsFromIssuanceOfLongTermDebt 2,174,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
Principal Payments on Long-Term Debt (666,749)us-gaap_RepaymentsOfLongTermDebt (613,914)us-gaap_RepaymentsOfLongTermDebt
Excess tax benefits from stock-based awards (17,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities  
Net Cash Provided by (Used in) Financing Activities 672,452us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 871,582us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
NET CHANGE IN CASH 66,371us-gaap_NetCashProvidedByUsedInContinuingOperations  
Cash - Beginning of Year 0us-gaap_CashAndCashEquivalentsAtCarryingValue 0us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH-END OF YEAR 66,371us-gaap_CashAndCashEquivalentsAtCarryingValue 0us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental Disclosure of Cash Flow Information:    
Cash Paid During the Period for Interest 359,727us-gaap_InterestPaidNet 366,335us-gaap_InterestPaidNet
Cash Paid During the Period for Income Taxes 417,615us-gaap_IncomeTaxesPaidNet 187,300us-gaap_IncomeTaxesPaidNet
Supplemental Noncash Investing and Financing Activities:    
Capital Expenditures in Accounts Payable $ 19,604us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 317,906us-gaap_CapitalExpendituresIncurredButNotYetPaid