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Concentrations (Details) (Revenue [Member])
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Concentration Of Revenue From Customers [Abstract]    
Concentration risk percentage 10.00%us-gaap_ConcentrationRiskPercentage1 10.00%us-gaap_ConcentrationRiskPercentage1
Customer A [Member]
   
Concentration Of Revenue From Customers [Abstract]    
Concentration risk percentage 12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= cws_CustomerAMember
   [1]
[1] * Less than 10%.