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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $)
Total
Common stock
Additional paid-in capital
Deferred Compensation
Statutory reserve
Accumulated other comprehensive income
Retained earnings
Balance at Dec. 31, 2012 $ 29,813,350us-gaap_StockholdersEquity $ 5,326us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 8,463,291us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 0us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
$ 2,212,951us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsAppropriatedMember
$ 3,619,119us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 15,512,663us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsUnappropriatedMember
Balance (in shares) at Dec. 31, 2012   5,326,501us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
         
Foreign currency translation adjustment 1,090,994us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsAppropriatedMember
1,090,994us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsUnappropriatedMember
Imputed interest on related party notes 16,762nfec_AdjustmentsToAdditionalPaidInCapitalInterestExpenseRelatedParty 0nfec_AdjustmentsToAdditionalPaidInCapitalInterestExpenseRelatedParty
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
16,762nfec_AdjustmentsToAdditionalPaidInCapitalInterestExpenseRelatedParty
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
0nfec_AdjustmentsToAdditionalPaidInCapitalInterestExpenseRelatedParty
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
0nfec_AdjustmentsToAdditionalPaidInCapitalInterestExpenseRelatedParty
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsAppropriatedMember
0nfec_AdjustmentsToAdditionalPaidInCapitalInterestExpenseRelatedParty
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0nfec_AdjustmentsToAdditionalPaidInCapitalInterestExpenseRelatedParty
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsUnappropriatedMember
Conversion of promissory notes and interest payable 994,836us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities 133us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
994,703us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
0us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
0us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsAppropriatedMember
0us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsUnappropriatedMember
Conversion of promissory notes and interest payable (in shares)   132,646us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
         
Amortization of deferred compensation 0us-gaap_AmortizationOfDeferredCharges            
Shares issued for service to be rendered 128,848us-gaap_StockIssuedDuringPeriodValueIssuedForServices 160us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
222,740us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(94,052)us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
0us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsAppropriatedMember
0us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsUnappropriatedMember
Shares issued for service to be rendered (in shares)   160,000us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
         
Close down of a subsidiary 0nfec_GainOrLossOnCloseDownOfSubsidiary            
Net loss for the year (180,165)us-gaap_NetIncomeLoss 0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsAppropriatedMember
0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(180,165)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsUnappropriatedMember
Appropriation to statutory reserve 0nfec_TransferToRetainedEarningsAppropriatedForLegalReserve 0nfec_TransferToRetainedEarningsAppropriatedForLegalReserve
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
0nfec_TransferToRetainedEarningsAppropriatedForLegalReserve
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
0nfec_TransferToRetainedEarningsAppropriatedForLegalReserve
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
13,927nfec_TransferToRetainedEarningsAppropriatedForLegalReserve
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsAppropriatedMember
0nfec_TransferToRetainedEarningsAppropriatedForLegalReserve
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(13,927)nfec_TransferToRetainedEarningsAppropriatedForLegalReserve
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsUnappropriatedMember
Balance at Dec. 31, 2013 31,864,625us-gaap_StockholdersEquity 5,619us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
9,697,496us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(94,052)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
2,226,878us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsAppropriatedMember
4,710,113us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
15,318,571us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsUnappropriatedMember
Balance (in shares) at Dec. 31, 2013   5,619,147us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
         
Foreign currency translation adjustment (197,163)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsAppropriatedMember
(198,198)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsUnappropriatedMember
Amortization of deferred compensation 94,052us-gaap_AmortizationOfDeferredCharges 0us-gaap_AmortizationOfDeferredCharges
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
0us-gaap_AmortizationOfDeferredCharges
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
94,052us-gaap_AmortizationOfDeferredCharges
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
0us-gaap_AmortizationOfDeferredCharges
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsAppropriatedMember
0us-gaap_AmortizationOfDeferredCharges
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_AmortizationOfDeferredCharges
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsUnappropriatedMember
Shares issued for service to be rendered 190,250us-gaap_StockIssuedDuringPeriodValueIssuedForServices 100us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
190,150us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
0us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
  0us-gaap_StockIssuedDuringPeriodValueIssuedForServices
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= us-gaap_AccumulatedOtherComprehensiveIncomeMember
0us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsUnappropriatedMember
Shares issued for service to be rendered (in shares)   100,000us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
         
Close down of a subsidiary (18,444)nfec_GainOrLossOnCloseDownOfSubsidiary 0nfec_GainOrLossOnCloseDownOfSubsidiary
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
0nfec_GainOrLossOnCloseDownOfSubsidiary
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
0nfec_GainOrLossOnCloseDownOfSubsidiary
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
(279)nfec_GainOrLossOnCloseDownOfSubsidiary
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsAppropriatedMember
0nfec_GainOrLossOnCloseDownOfSubsidiary
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(18,165)nfec_GainOrLossOnCloseDownOfSubsidiary
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsUnappropriatedMember
Net loss for the year (617,291)us-gaap_NetIncomeLoss 0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsAppropriatedMember
0us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(599,126)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsUnappropriatedMember
Appropriation to statutory reserve 0nfec_TransferToRetainedEarningsAppropriatedForLegalReserve 0nfec_TransferToRetainedEarningsAppropriatedForLegalReserve
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
0nfec_TransferToRetainedEarningsAppropriatedForLegalReserve
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
0nfec_TransferToRetainedEarningsAppropriatedForLegalReserve
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
1,035nfec_TransferToRetainedEarningsAppropriatedForLegalReserve
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsAppropriatedMember
0nfec_TransferToRetainedEarningsAppropriatedForLegalReserve
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(1,035)nfec_TransferToRetainedEarningsAppropriatedForLegalReserve
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsUnappropriatedMember
Balance at Dec. 31, 2014 $ 31,333,159us-gaap_StockholdersEquity $ 5,719us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 9,887,646us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 0us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
$ 2,227,634us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsAppropriatedMember
$ 4,511,915us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 14,700,245us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsUnappropriatedMember
Balance (in shares) at Dec. 31, 2014   5,719,147us-gaap_SharesOutstanding
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= us-gaap_CommonStockMember