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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 $ 4,266,417us-gaap_IncomeLossAttributableToParent $ 8,185,577us-gaap_IncomeLossAttributableToParent
Adjustments to reconcile net income from operations to net cash provided by operating activities:    
Depreciation 8,469,771us-gaap_Depreciation 6,704,386us-gaap_Depreciation
Amortization of land use rights 96,226us-gaap_AmortizationOfIntangibleAssets 95,491us-gaap_AmortizationOfIntangibleAssets
Increase in inventory reserve   41,381cws_IncreaseDecreaseInInventoryReserve
Increase (decrease) in allowance for doubtful accounts 521,928us-gaap_ProvisionForDoubtfulAccounts (628,188)us-gaap_ProvisionForDoubtfulAccounts
Increase in allowance for deferred tax assets 2,165,677us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount   
Loss on impairment of equipment held for sale/operating lease 3,799,947us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges 2,573,256us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges
Loss on disposal of fixed assets    11,391us-gaap_GainLossOnDispositionOfAssets1
Stock-based compensation 375,989us-gaap_ShareBasedCompensation 423,112us-gaap_ShareBasedCompensation
Changes in operating assets and liabilities:    
Notes receivable 586,014us-gaap_IncreaseDecreaseInNotesReceivableCurrent (604,798)us-gaap_IncreaseDecreaseInNotesReceivableCurrent
Accounts receivable (5,668,901)us-gaap_IncreaseDecreaseInAccountsReceivable (4,126,440)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories 470,509us-gaap_IncreaseDecreaseInInventories 1,303,519us-gaap_IncreaseDecreaseInInventories
Prepaid value-added taxes on purchases 486,689us-gaap_IncreaseDecreaseInPrepaidExpense 70,059us-gaap_IncreaseDecreaseInPrepaidExpense
Prepaid and other current assets (94,718)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 91,666us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Advances to suppliers 126,394us-gaap_IncreaseDecreaseInDeferredCharges (81,120)us-gaap_IncreaseDecreaseInDeferredCharges
Deferred tax assets (1,080,469)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes   
Accounts payable (872,178)us-gaap_IncreaseDecreaseInAccountsPayable (1,809,914)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued expenses 164,465us-gaap_IncreaseDecreaseInAccruedLiabilities (112,797)us-gaap_IncreaseDecreaseInAccruedLiabilities
VAT and service taxes payable 374,512us-gaap_IncreaseDecreaseInPropertyAndOtherTaxesPayable (86,004)us-gaap_IncreaseDecreaseInPropertyAndOtherTaxesPayable
Income taxes payable (1,077,373)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable (129,378)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Advances from customers (952,885)us-gaap_IncreaseDecreaseInCustomerAdvances (452,658)us-gaap_IncreaseDecreaseInCustomerAdvances
NET CASH PROVIDED BY OPERATING ACTIVITIES 12,158,014us-gaap_NetCashProvidedByUsedInOperatingActivities 11,468,541us-gaap_NetCashProvidedByUsedInOperatingActivities
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (11,058,530)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (14,633,745)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Refund of previously purchased property and equipment 3,991,405us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment   
NET CASH USED IN INVESTING ACTIVITIES (7,067,125)us-gaap_NetCashProvidedByUsedInInvestingActivities (14,633,745)us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on capital lease    (391,963)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Proceeds from bank loans 3,906,759us-gaap_ProceedsFromOtherShortTermDebt 5,653,824us-gaap_ProceedsFromOtherShortTermDebt
Repayments of bank loans (3,906,759)us-gaap_RepaymentsOfOtherShortTermDebt (4,846,135)us-gaap_RepaymentsOfOtherShortTermDebt
Decrease (increase) in restricted cash 195,338us-gaap_ProceedsFromRepaymentsOfRestrictedCashFinancingActivities (678,459)us-gaap_ProceedsFromRepaymentsOfRestrictedCashFinancingActivities
(Decrease) increase in bank acceptance notes payable (195,338)us-gaap_ProceedsFromBankDebt 678,459us-gaap_ProceedsFromBankDebt
Net proceeds from sale of common stock 1,623,691us-gaap_ProceedsFromIssuanceOfCommonStock 2,388,589us-gaap_ProceedsFromIssuanceOfCommonStock
NET CASH PROVIDED BY FINANCING ACTIVITIES 1,623,691us-gaap_NetCashProvidedByUsedInFinancingActivities 2,804,315us-gaap_NetCashProvidedByUsedInFinancingActivities
EFFECT OF EXCHANGE RATE ON CASH AND CASH EQUIVALENTS 6,338us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 30,034us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 6,720,918us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (330,855)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS - beginning of year 1,114,873us-gaap_CashAndCashEquivalentsAtCarryingValue 1,445,728us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS - end of year 7,835,791us-gaap_CashAndCashEquivalentsAtCarryingValue 1,114,873us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid for:    
Interest 238,226us-gaap_InterestPaid 300,381us-gaap_InterestPaid
Income taxes 4,553,195us-gaap_IncomeTaxesPaid 3,129,174us-gaap_IncomeTaxesPaid
NON-CASH INVESTING AND FINANCING ACTIVITIES:    
Property and equipment acquired on credit as payable $ 256,082cws_IncreaseInPropertyInExchangeForIncreaseInPayable $ 1,121,719cws_IncreaseInPropertyInExchangeForIncreaseInPayable