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Segment information (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Retail [Member]      
Segment Reporting Information [Line Items]      
Depreciation, Depletion and Amortization $ 2,470,597us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_RetailMember
$ 2,144,095us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_RetailMember
$ 2,240,083us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_RetailMember
Bulk [Member]      
Segment Reporting Information [Line Items]      
Depreciation, Depletion and Amortization 3,130,719us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_BulkMember
3,215,039us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_BulkMember
5,387,221us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_BulkMember
Services [Member]      
Segment Reporting Information [Line Items]      
Depreciation, Depletion and Amortization $ 102,396us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_ServicesMember
$ 292,335us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_ServicesMember
$ 280,617us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= cwco_ServicesMember