Represents the maximum capital expenditures from covenant terms under the credit facility.

No definition available.

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Namespace Prefix:	sgrp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the maximum indebtedness to tangible net work ratio from covenant terms under the credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	sgrp_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the minimum consolidated tangible net worth under the credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	sgrp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the minimum fixed charge coverage ratio from covenant terms under the credit facility.

+ References

No definition available.

+ Details

Name:	sgrp_LineOfCreditFacilityCovenantTermsMinimumFixedChargeCoverageRatio
Namespace Prefix:	sgrp_
Data Type:	xbrli:pureItemType
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Period Type:	instant

- Definition

Represents the minimum tangible net worth under the credit facility.

+ References

No definition available.

+ Details

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Namespace Prefix:	sgrp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the percentage of increase in combined and consolidated net profit from covenant terms under the credit facility.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percent of eligible domestic accounts receivable less certain reserves to calculate borrowing availability.

+ References

No definition available.

+ Details

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

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

+ Details

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

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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

- Definition

Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
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-Name Accounting Standards Codification
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-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_LoansPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_CreditFacilityAxis=sgrp_SterlingCreditFacilityMember
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Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_PrimeRateMember
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Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=sgrp_OxfordFundingPtyLtdMember
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- Details

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- Details

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Period Type:

- Details

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Note 4 - Credit Facilities (Details Textual) MXN in Millions				9 Months Ended
	Sep. 28, 2015 USD ($)	Mar. 07, 2011 USD ($)	Mar. 07, 2011 JPY (¥)	Sep. 30, 2016 USD ($)	Sep. 30, 2016 JPY (¥)	Sep. 30, 2016 MXN	Sep. 30, 2016 AUD	Mar. 07, 2011 JPY (¥)
Sterling Credit Facility [Member] \| Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate				0.50%
Sterling Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 8,500,000			$ 8,500,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage				0.125%
Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability				85.00%	85.00%	85.00%	85.00%
Line of Credit Facility, Covenant Terms, Minimum Tangible Net Worth	3,400,000
Line of Credit Facility, Covenant Terms, Minimum Consolidated Tangible Net Worth	$ 4,800,000
Line of Credit Facility, Covenant Terms, Percent of Increase in Net Profit	50.00%
Line of Credit Facility, Covenant Terms, Maximum Indebtedness to Tangible Net Worth Ratio	3
Line of Credit Facility, Covenant Terms, Minimum Fixed Charge Coverage Ratio	1.5
Line of Credit Facility, Covenant Terms, Maximum Capital Expenditures	$ 2,000,000
Oxford Funding Pty Ltd [Member]
Line of Credit Facility, Maximum Borrowing Capacity				$ 916,000			AUD 1,200,000
Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability				80.00%	80.00%	80.00%	80.00%
Long-term Line of Credit				$ 342,000			AUD 448,000
Revolving Credit Facility [Member] \| Interbank Interest Rate [Member] \| BBVA Bancomer Bank [Member]
Debt Instrument, Basis Spread on Variable Rate				4.00%
Revolving Credit Facility [Member] \| BBVA Bancomer Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity				$ 257,000		MXN 5
Long-term Line of Credit				$ 257,000		MXN 5
Debt Instrument, Term				2 years
Line of Credit Facility, Interest Rate at Period End				8.50%	8.50%	8.50%	8.50%
Mizuho Bank [Member]
Debt Instrument, Face Amount		$ 198,000						¥ 20,000,000
Debt Instrument, Periodic Payment		$ 2,400	¥ 238,000
Debt Instrument, Interest Rate, Stated Percentage		0.10%						0.10%
Loans Payable				$ 40,000	¥ 4,100,000
Line of Credit Facility, Interest Rate at Period End				0.10%	0.10%	0.10%	0.10%
BBVA Bancomer Bank [Member]
Line of Credit Facility, Interest Rate at Period End				8.50%	8.50%	8.50%	8.50%