Subsequent Events (Details) $ in Thousands	1 Months Ended
Apr. 30, 2021 USD ($)
Subsequent Event [Member]
Subsequent Events [Abstract]
Refund of employee retention credit	$ 2,400

The amount of refund eligible to receive under employee retention credit program.

No definition available.

Name:	gvp_RefundOfEmployeeRetentionCredit
Namespace Prefix:	gvp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration