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Income Taxes (Details 1)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
U.S. statutory federal rate and effective tax rate    
U.S. statutory rates 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
U.S. effective rate in excess of China tax rate 2.50%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (9.60%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
China valuation allowance 12.30%cws_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowancePercentForeign 0.00%cws_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowancePercentForeign
U.S. valuation allowance 2.90%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 2.40%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Total provision for income taxes 51.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations 26.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations