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This is really a legal/accounting question, so I will add a standard disclaimer that you should consult an attorney to be safe. XBRL is used to make financial reporting and SEC compliance more transparent. If you are not a publically traded company, it is my understanding that this would not apply to you. If you are, I believe it is the required format for annual and quarterly reports, and presumably that applies to any posted on the company website as well as those submitted for regulatory purposes. This is not my field of expertise though, so you should really check with an attorney/accountant.