Question: how to open xbrl file?
Answer: Go to sourceforge.net/projects/rivetdragonview.
Download the Dragon View XBRL Viewer.
Unzip Dragon View.
Open Dragon View.
Click "File," highlight "Open" and then click either "XBRL Taxonomy" or "XBRL Instance Document."
Find and click the XBRL file you want view and click "Open."