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Note 8 - Employee Benefit Plans (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |
Deferred Compensation Arrangement with Individual, Employer Contribution | $ 42,000 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution | $ 54,000 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution | $ 62,000 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
Three Percent of Base Salary [Member] |  |  |
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |
Defined Benefit Plan Company Contribution, Percentage of a Percentage of Annual Base Salary | 100.00%cdzi_DefinedBenefitPlanCompanyContributionPercentageOfAPercentageOfAnnualBaseSalary / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cdzi_ThreePercentOfBaseSalaryMember |  |
Two Percent of Base Salary [Member] |  |  |
Note 8 - Employee Benefit Plans (Details) [Line Items] |  |  |
Defined Benefit Plan Company Contribution, Percentage of a Percentage of Annual Base Salary | 50.00%cdzi_DefinedBenefitPlanCompanyContributionPercentageOfAPercentageOfAnnualBaseSalary / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = cdzi_TwoPercentOfBaseSalaryMember |  |

X
- Definition Represents the amount of 401(k) contribution matched by the Company, expressed as a percentage of a specified percentage of annual base salary. + References No definition available. + Details
Name: | cdzi_DefinedBenefitPlanCompanyContributionPercentageOfAPercentageOfAnnualBaseSalary
Namespace Prefix: | cdzi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | cdzi_Note8EmployeeBenefitPlansDetailsLineItems
Namespace Prefix: | cdzi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement. + References No definition available. + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=cdzi_ThreePercentOfBaseSalaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=cdzi_TwoPercentOfBaseSalaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |