What data is available from the SEC in XBRL format? Is it just 10-Qs and 10-Ks, or other filings as well?
When did XBRL become mandatory for all filers (or is it still not?)
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XBRL became mandatory for US filers on June 15th, 2011. The SEC requires XBRL data for:
XBRL instances for quarterly and annual reports would typically contain the usual items found on Income statements, Balance Sheets, and Cash Flows.