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Cost of revenues and general and administrative expenses (Details 1) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cost of revenues and general and administrative expenses [Line Items] |  |  |
General and Administrative Expense | $ 16,654,439 us-gaap_GeneralAndAdministrativeExpense | $ 15,844,303 us-gaap_GeneralAndAdministrativeExpense | $ 14,542,817 us-gaap_GeneralAndAdministrativeExpense
Employee costs [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
General and Administrative Expense | 6,314,908 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_EmployeeCostsMember | 6,218,948 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_EmployeeCostsMember | 5,751,142 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_EmployeeCostsMember
Insurance [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
General and Administrative Expense | 923,089 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_InsuranceMember | 969,370 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_InsuranceMember | 968,662 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_InsuranceMember
Professional fees [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
General and Administrative Expense | 1,424,927 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_ProfessionalsFeeMember | 1,005,495 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_ProfessionalsFeeMember | 1,183,660 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_ProfessionalsFeeMember
Directors' fees and expenses [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
General and Administrative Expense | 686,228 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_DirectorsFeesAndExpensesMember | 752,044 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_DirectorsFeesAndExpensesMember | 533,715 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_DirectorsFeesAndExpensesMember
Depreciation [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
General and Administrative Expense | 278,478 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_DepreciationMember | 290,622 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_DepreciationMember | 421,851 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_DepreciationMember
NSC project expenses [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
General and Administrative Expense | 3,702,332 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_NscProjectExpensesMember | 3,158,309 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_NscProjectExpensesMember | 1,656,831 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_NscProjectExpensesMember
Other [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
General and Administrative Expense | $ 3,324,477 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_OtherCreditDeviceMember | $ 3,449,515 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_OtherCreditDeviceMember | $ 4,026,956 us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConcentrationRiskByBenchmarkAxis = cwco_OtherCreditDeviceMember

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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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