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Note 2 - Summary of Significant Accounting Policies (Details) - Adjustments to Goodwill (USD $) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | May 31, 1988
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Adjustments to Goodwill [Abstract] |  |  |  |
Balance at December 31 | $ 3,813,000 us-gaap_Goodwill | $ 3,813,000 us-gaap_Goodwill | $ 3,813,000 us-gaap_Goodwill | $ 7,006,000 us-gaap_Goodwill

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

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant