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Note 10 - Stock-based Compensation Plans and Warrants (Details) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 1 Months Ended 2 Months Ended 41 Months Ended 1 Months Ended 60 Months Ended
Oct. 30, 2014
Nov. 30, 2011
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2009
Jul. 01, 2014
Dec. 31, 2014
Jan. 10, 2011
Jan. 14, 2010
Mar. 31, 2014
Oct. 30, 2012
Sep. 30, 2014
May 31, 2014
Jun. 30, 2014
May 31, 2014
Dec. 18, 2009
Dec. 31, 2014
Dec. 30, 2012
Dec. 31, 2011
Jun. 10, 2014
Jan. 11, 2011
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number       822,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber [1] 842,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber       822,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber [1]                   822,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber [1] 862,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 862,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       206,858us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 19,483us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod                                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period       81,827us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod 13,795us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod                                    
Allocated Share-based Compensation Expense (in Dollars)       $ 1,077,000us-gaap_AllocatedShareBasedCompensationExpense $ 100,000us-gaap_AllocatedShareBasedCompensationExpense $ 99,000us-gaap_AllocatedShareBasedCompensationExpense                                  
Number Of Equity Incentive Plans                       3cdzi_NumberOfEquityIncentivePlans                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period       0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised                                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross                                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in Dollars per share)       $ 11.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 11.84us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice       11.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice                   11.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 11.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 11.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice    
Proceeds from Issuance of Private Placement (in Dollars)   6,000,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement                                          
Proceeds from Lines of Credit (in Dollars)     17,500,000us-gaap_ProceedsFromLinesOfCredit                                        
Class of Warrant or Right, Expirations 112,500cdzi_ClassOfWarrantOrRightExpirations                                            
Class of Warrant or Right, Outstanding       0us-gaap_ClassOfWarrantOrRightOutstanding         0us-gaap_ClassOfWarrantOrRightOutstanding                   0us-gaap_ClassOfWarrantOrRightOutstanding        
Water Project [Member] | Restricted Stock Units (RSUs) [Member] | 2014 Equity Incentive Plan [Member]                                              
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                                           200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= cdzi_WaterProjectMember
/ us-gaap_PlanNameAxis
= cdzi_TwentyFourteenEquityIncentivePlanMember		  
Private Placement [Member] | Warrants Issued For Every 3 Shares of Common Stock [Member]                                              
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Warrant Issued   1cdzi_WarrantIssued
/ us-gaap_StatementScenarioAxis
= cdzi_WarrantsIssuedForEveryThreeSharesOfCommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember		                                          
Private Placement [Member]                                              
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period   666,667us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember		                                          
Sale of Stock, Price Per Share (in Dollars per share)   $ 9us-gaap_SaleOfStockPricePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember		                                          
Base For Issuing Purchase Warrants   3cdzi_BaseForIssuingPurchaseWarrants
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember		                                          
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right   1us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember		                                          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)   $ 13us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember		                                          
Common Stock [Member] | 2009 Equity Incentive Plan [Member]                                              
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number       507,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= cdzi_TwoThousandNineEquityIncentivePlanMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		         507,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= cdzi_TwoThousandNineEquityIncentivePlanMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		                   507,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= cdzi_TwoThousandNineEquityIncentivePlanMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		        
Common Stock [Member]                                              
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Stock Issued During Period, Shares, Other       24,441us-gaap_StockIssuedDuringPeriodSharesOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		                                      
Employee Stock Option [Member] | 2009 Equity Incentive Plan [Member]                                              
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period             10 years                                
Employee Stock Option [Member]                                              
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Allocated Share-based Compensation Expense (in Dollars)       0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 43,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 284,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                                  
Restricted Stock Units (RSUs) [Member] | Senior Management [Member] | 2014 Equity Incentive Plan [Member]                                              
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                                           162,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= cdzi_TwentyFourteenEquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= cdzi_SeniorManagementMember		  
Restricted Stock Units (RSUs) [Member] | 2014 Equity Incentive Plan [Member]                                              
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period               162,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= cdzi_TwentyFourteenEquityIncentivePlanMember		                              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period                 32,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= cdzi_TwentyFourteenEquityIncentivePlanMember		                            
Restricted Stock [Member] | 2009 Equity Incentive Plan [Member]                                              
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures                   140,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cdzi_TwoThousandNineEquityIncentivePlanMember		 115,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cdzi_TwoThousandNineEquityIncentivePlanMember		                        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant                                             595,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= cdzi_TwoThousandNineEquityIncentivePlanMember
Accrues Yearly [Member] | Outside Director [Member] | 2014 Equity Incentive Plan [Member]                                              
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Officers' Compensation (in Dollars)       30,000us-gaap_OfficersCompensation
/ us-gaap_PlanNameAxis
= cdzi_TwentyFourteenEquityIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= cdzi_AccruesYearlyMember
/ us-gaap_TitleOfIndividualAxis
= cdzi_OutsideDirectorMember		                                      
Allocated Share-based Compensation Expense (in Dollars)                       20,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= cdzi_TwentyFourteenEquityIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= cdzi_AccruesYearlyMember
/ us-gaap_TitleOfIndividualAxis
= cdzi_OutsideDirectorMember		                      
Accrues Quarterly [Member] | Outside Director [Member] | 2014 Equity Incentive Plan [Member]                                              
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Officers' Compensation (in Dollars)                       7,500us-gaap_OfficersCompensation
/ us-gaap_PlanNameAxis
= cdzi_TwentyFourteenEquityIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= cdzi_AccruesQuarterlyMember
/ us-gaap_TitleOfIndividualAxis
= cdzi_OutsideDirectorMember		                      
Allocated Share-based Compensation Expense (in Dollars)                       5,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= cdzi_TwentyFourteenEquityIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= cdzi_AccruesQuarterlyMember
/ us-gaap_TitleOfIndividualAxis
= cdzi_OutsideDirectorMember		                      
Term Loan [Member]                                              
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)                         $ 10us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_DebtInstrumentAxis
= cdzi_TermLoanMember		                    
Proceeds from Lines of Credit (in Dollars)                         $ 5,000,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_DebtInstrumentAxis
= cdzi_TermLoanMember		                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights                         250,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_DebtInstrumentAxis
= cdzi_TermLoanMember		                    
Class of Warrant or Right, Exercise Term                         2 years                    
Class of Warrant or Right, Exercised                           137,500cdzi_ClassOfWarrantOrRightExercised
/ us-gaap_DebtInstrumentAxis
= cdzi_TermLoanMember		                  
Stock Issued During Period, Shares, Other                           24,411us-gaap_StockIssuedDuringPeriodSharesOther
/ us-gaap_DebtInstrumentAxis
= cdzi_TermLoanMember		                  
Minimum [Member]                                              
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in Dollars per share)       $ 9.88us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		         9.88us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		                   9.88us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		        
Maximum [Member]                                              
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in Dollars per share)       $ 13.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		         13.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                   13.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		        
Director [Member] | 2009 Equity Incentive Plan [Member]                                              
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period                             42,265us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= cdzi_TwoThousandNineEquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		                
Director [Member] | 2014 Equity Incentive Plan [Member]                                              
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period       14,514us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= cdzi_TwentyFourteenEquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		                                      
Directors and Consultants [Member] | 2014 Equity Incentive Plan [Member]                                              
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period       44,358us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= cdzi_TwentyFourteenEquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= cdzi_DirectorsAndConsultantsMember		                                      
2003 Management Equity Incentive Plan [Member]                                              
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number       315,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= cdzi_TwoThousandThreeManagementEquityIncentivePlanMember		         315,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= cdzi_TwoThousandThreeManagementEquityIncentivePlanMember		                   315,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= cdzi_TwoThousandThreeManagementEquityIncentivePlanMember		        
2009 Equity Incentive Plan [Member]                                              
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                                   850,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= cdzi_TwoThousandNineEquityIncentivePlanMember		          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                                   24 months          
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period                                     537,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_PlanNameAxis
= cdzi_TwoThousandNineEquityIncentivePlanMember		        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period                               45,235us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_PlanNameAxis
= cdzi_TwoThousandNineEquityIncentivePlanMember		 20,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_PlanNameAxis
= cdzi_TwoThousandNineEquityIncentivePlanMember		            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures                             507,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_PlanNameAxis
= cdzi_TwoThousandNineEquityIncentivePlanMember		                
2014 Equity Incentive Plan [Member]                                              
Note 10 - Stock-based Compensation Plans and Warrants (Details) [Line Items]                                              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                                           675,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= cdzi_TwentyFourteenEquityIncentivePlanMember		  
[1] Exercise prices vary from $9.88 to $13.95, and expiration dates vary from May 2015 to December 2021.