Brief introduction to XBRL using analogy of bar code. A link to "A Primer on XBRL, the Extensible Business Reporting language" is included at the end of the webpage, which covers such topics as "The Function of XBRL," "How XBRL Works," "XBRL Initiatives by U.S. Institutions," "XBRL Initiatives by non-U.S. Institutions," and so on.

The American Institute of Certified Public Accountants is the national, professional organization for all Certified Public Accountants. Its mission is to provide members with the resources, information, and leadership that enable them to provide valuable services in the highest professional manner to benefit the public as well as employers and clients.

In fulfilling its mission, the AICPA has developed a number of materials introducing XBRL and information about XBRL.  This link will take you to a number of XBRL resources available from the AICPA.

This web site provides an overview of XBRL from the perspective of the Accounting Profession. This website also provides links to various other sources.