Wikipedia
XBRLS (XBRL Simple Application Profile) is an application profile of XBRL.
XBRLS is designed to be 100% XBRL compliant. The stated goals of XBRLS are "to maximize XBRL's benefits, reduce costs of implementation, and maximize the functionality and effectiveness of XBRL". XBRL is a general purpose specification, based on the idea that no one is likely to use 100% of the components of XBRL in building any one solution. XBRLS specifies a subset of XBRL that is designed to meet the needs of most business users in most situations, and offers it as a starting point for others. This approach creates an application profile of XBRL (equivalent to a database view but concerned with metadata, not data).
XBRLS is intended to enable the non-XBRL expert to create both XBRL metadata and XBRL reports in a simple and convenient manner. At the same time, it seeks to improve the usability of XBRL, the interoperability among XBRL-based solutions, the effectiveness of XBRL extensions and to reduce software development costs.
The profile was created by Rene van Egmond and Charlie Hoffman, who was the initial creator of XBRL. It borrows heavily from the US GAAP Taxonomy Architecture.