Note 8 - Commitments and Contingencies (Details Textual)	Sep. 30, 2019
Majority Stockholders [Member]
Majority Shareholders Interest, Ownership Percentage	55.80%

Represents the majority shareholders' interest expressed as a percentage.

No definition available.

Name:	sgrp_MajorityShareholdersInterestOwnershipPercentage
Namespace Prefix:	sgrp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant