[BUG] iXBRLViewerPlugin: Build iXBRL with EFRAG Sample XBRL file thanks to iXBRLViewerPlugin plugin fails

[frinux]

What happened?

I am trying to produce an iXBRL file from a sample xhtml file produced by EFRAG:

• zip file containing XBRL files is here
• this zip is published here
• an example file is provided in the documents field

I am following the steps given in the README:

• plugin is installed in Arelle GUI
• XHTML file is opened in GUI
• menu tools -> iXBRL viewer -> Save Viewer

Result:

• exception in the logs
• no file generated

Thanks in advance!

Version

1.4.22

With which browsers are you experiencing the bug?

Firefox, Chrome, Safari, Microsoft Edge

Documents

efrag-2026-12-31-en.zip

Screenshots

[austinmatherne-wk]

Hi @frinux,

I'm unable to replicate this issue with the latest version of Arelle and ixbrl-viewer. Can you check what version of Arelle you're using?

[frinux]

Sure!
I'm on Arelle 2.25.8 on Ubuntu (downloaded the tgz this afternoon from the website)

[austinmatherne-wk]

Do you have any additional plugins enabled? Also were there any other messages in the log before you tried to save the viewer?

[frinux]

I managed to make it work, and found the scenario producing this issue:

1. Open the XBRL file (see file below)
2. Open the XHTML file (without closing the previous file)
3. Try to save viewer -> viewer:exception

It seems that opening the XHTML file does not clear completely the context and 'pollutes' the app when trying to save the viewer.

efrag-2025-12-31-en.xbrl.tar.gz