You can advertise your company and its works and products related to XBRL on xbrlblog.com for no money!!!
But it is not absolutely free. There is one small precondition if you want to advertise your company on this site - you need to become an Author and post at least one article related to XBRL per week. For that period of time, while you are act as Author, you can place a banner of your company (dimensions 250×100px) at the right sidebar for free. There is one more benefit from being an Author - you can advertise you company, also, through the articles you are posting on.
Publishing an article is very easy - contact me on this email to get an author account and start advertising by writing!
