The European Commission has issued a communication relating to the preparation and audit of financial statements created using the ESEF (European Single Electronic Format, which is XBRL). Here is that communication in English formatted in HTML. The last paragraph in section 2.1 states: (emphasis is mine)
To ensure the integrity of the internal market and a homogeneous level of protection for all users of financial statements and annual financial reports, users should be granted the same level of protection irrespective of how they access the information contained in the financial statements, be it for instance via scanned-paper documents or via electronically structured documents.
Need a tool to make sure your XBRL properly conveys what you desired to convey and that the financial report is a properly functioning system? See this concept paper about Pacioli. See this prototype of what that audit tool might look like.
Here is information related to how to create corporate financial reports correctly.
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