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Note 12 - Subsequent Events (Details Textual) - USD ($) | Jun. 05, 2024 | Jul. 23, 2024
--- | --- | ---
Subsequent Event [Member] | SPAR Japan [Member] |  |
Disposal Group, Including Discontinued Operation, Consideration |  | $ 500,000
Subsequent Event [Member] | SPAR Japan [Member] |  |
Majority Interest Ownership Percentage By Parent |  | 100.00%
Highwire Capital Acquiring SGRP [Member] |  |
Business Acquisition, Share Price (in dollars per share) | $ 2.5 |
Business Combination, Price of Acquisition, Expected | $ 58,000,000 |

X
- Definition The parent entity's majority interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | sgrp_MajorityInterestOwnershipPercentageByParent
Namespace Prefix: | sgrp_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionSharePrice
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Purchase price of expected business acquisition prior to consideration being transferred. Excludes asset acquisition. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 15 -Paragraph 3 -SubTopic 10 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479455/805-10-15-3 + Details
Name: | us-gaap_BusinessCombinationPriceOfAcquisitionExpected
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=sgrp_SparJapanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=sgrp_SparJapanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=sgrp_HighwireCapitalAcquiringSgrpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |