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Note 1 - Business and Organization - Percentage of the Company's Equity Ownership (Details)	Dec. 31, 2019
NEW YORK
Majority Interest Ownership Percentage By Parent	100.00%
Georgia [Member]
Majority Interest Ownership Percentage By Parent	51.00%
FLORIDA
Majority Interest Ownership Percentage By Parent	51.00%
JAPAN
Majority Interest Ownership Percentage By Parent	100.00%
CANADA
Majority Interest Ownership Percentage By Parent	100.00%
SOUTH AFRICA
Majority Interest Ownership Percentage By Parent	51.00%
INDIA
Majority Interest Ownership Percentage By Parent	51.00%
AUSTRALIA
Majority Interest Ownership Percentage By Parent	51.00%
CHINA
Majority Interest Ownership Percentage By Parent	51.00%
MEXICO
Majority Interest Ownership Percentage By Parent	51.00%
TURKEY
Majority Interest Ownership Percentage By Parent	51.00%
BRAZIL
Majority Interest Ownership Percentage By Parent	51.00%

X

- Definition

The parent entity's majority interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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

X

- Details

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X

- Details

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Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_FL
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Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_JP
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Period Type:

X

- Details

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X

- Details

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X

- Details

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X

- Details

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- Details

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- Details

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X

- Details

Name:	srt_StatementGeographicalAxis=country_TR
Namespace Prefix:
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X

- Details

Name:	srt_StatementGeographicalAxis=country_BR
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