Consolidated Statements of Cash Flows (Unaudited) (Parentheticals) - shares	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Warrants exercised (in shares)	1,200,000

The number of warrants or rights exercised during period.

No definition available.

Name:	sgldf_ClassOfWarrantOrRightExercisedDuringPeriod
Namespace Prefix:	sgldf_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration