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Note 1 - The Corporation and Operations
 9 Months Ended
Jun. 30, 2011
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
Note 1 - The Corporation and Operations

    The Daily Journal Corporation (the “Company”) publishes newspapers and web sites covering California and Arizona, as well as the California Lawyer magazine, and produces several specialized information services. It also serves as a newspaper representative specializing in public notice advertising. Sustain Technologies, Inc. (“Sustain”), a wholly-owned subsidiary, supplies case management software systems and related products to courts and other justice agencies, including administrative law organizations.  These courts and agencies use the Sustain family of products to help manage cases and information electronically and to interface with other critical justice partners.  Essentially all of the Company’s operations are based in California, Arizona and Colorado.