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

No definition available.

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- Definition

Number of available field merchandising specialists.

+ References

No definition available.

+ Details

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- Definition

Number of full-time national, regional, and district administrators.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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- Definition

Represents number of vehicles leased under lease arrangement.

+ References

No definition available.

+ Details

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- Definition

Represents number of vehicles subleased.

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No definition available.

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- Definition

The amount of cash paid for domestic related party services.

+ References

No definition available.

+ Details

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- Definition

Percent of service provided by related party.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Percentage of ownership by a related person in a related entity.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
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- Definition

The amount of legal expenses reimbursed by the company to the related party.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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Data Type:	xbrli:durationItemType
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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
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-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=77990344&loc=SL6759159-111685

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Data Type:	num:percentItemType
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- Details

Name:	us-gaap_BusinessAcquisitionAxis=sgrp_SGRPHoldingsMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Period Type:

- Details

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Period Type:

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Note 6 - Related Party Transactions (Details Textual)			3 Months Ended		5 Months Ended	10 Months Ended
Note 6 - Related Party Transactions (Details Textual)	Sep. 13, 2016	Sep. 08, 2016 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	May 31, 2016	Mar. 31, 2017
Related Party Transaction, Expenses from Transactions with Related Party			$ 7,432,000	$ 6,373,000
SGRP Holdings [Member]
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Merhold Property Trust [Member]
Number Of Vehicles Subleased			2
Number Of Vehicles Leased			126
Lessee, Operating Lease, Term of Contract			4 years
SGRP Holdings [Member] \| SPAR BSMT Joint Venture [Member]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	51.00%
JKC [Member] \| SPAR BSMT Joint Venture [Member]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	39.00%
EILLC [Member] \| SPAR BSMT Joint Venture [Member]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	10.00%
SBS [Member]
Number of Merchandising Specialists			4,100
Number of National, Regional, and District Administrators			55	56
Related Party Transaction, Reimbursement of Legal Expenses from Transaction with Related Party			$ 85,000	$ 354,000
SBS [Member] \| Domestic Merchandising Specialists Field Force [Member]
Payments for Related Party Services			$ 5,900,000	$ 4,900,000
Percent Of Service Provided By Related Party			83.00%	80.00%
SBS [Member] \| Domestic Field Management [Member]
Payments for Related Party Services			$ 1,100,000	$ 1,100,000
Percent Of Service Provided By Related Party			92.00%	93.00%
SBS [Member] \| Cost Plus Fees [Member]
Related Party Transaction, Rate			2.96%		4.00%	2.00%
SBS And SAS [Member] \| Domestic Field Management [Member]
Related Party Transaction, Expenses from Transactions with Related Party			$ 6,900,000	$ 6,100,000
NRS [Member]
Majority Interest Ownership Percentage By Parent			51.00%			51.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners			49.00%			49.00%
C M R Meridien [Member]
Majority Interest Ownership Percentage By Parent			51.00%			51.00%
Mr. Brian Mason Mr. Garry Bristow And Mr. Adrian Wingfield [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners			49.00%			49.00%
Mr. Mason [Member] \| Merhold Property Trust [Member]
Related Party Ownership Percentage			50.00%
Mr. Mason [Member] \| Merhold Holding Trust [Member]
Related Party Ownership Percentage			46.70%
Mr. Mason and Mr. Bristow [Member] \| Merhold Cape Property Trust [Member]
Related Party Ownership Percentage			50.00%
Mr. Bristow [Member] \| Merhold Holding Trust [Member]
Related Party Ownership Percentage			20.00%
Mr. Wingfield [Member] \| Merhold Holding Trust [Member]
Related Party Ownership Percentage			33.30%
NDS [Member]
Majority Interest Ownership Percentage By Parent			51.00%			51.00%
Mr And Ms Yilmaz [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners			49.00%			49.00%
Mr. Juan F. Medina Domenzain [Member] \| CON [Member]
Related Party Ownership Percentage			90.00%
SPAR InfoTech, Inc. [Member] \| Assistance Provided in Connection to Brazilian Acquisition [Member]
Related Party Transaction, Amounts of Transaction		$ 49,000