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Note 16 - Subsequent Events (Details Textual) - Subsequent Event [Member] - William Bartels [Member] | Jan. 18, 2020 USD ($)
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Five Yer Period Agreement, Retirement Compensation | $ 100,000
Five Year Period Agreement, Annual Regular Fees | 55,000
Five Year Period Agreement, Annual Supplemental Fees | 50,000
Five Year Period Agreement, Annual Medical Benefits | 15,588
Five Year Period Agreement, Annual Compensation | 220,558
Five Year Period Agreement, Total Compensation | $ 1,102,940
SPAR Group [Member] |
Related Party Ownership Percentage | 25.10%

X
- Definition The total compensation including all benefits to be paid per year under the five year period agreement. + References No definition available. + Details
Name: | sgrp_FiveYearPeriodAgreementAnnualCompensation
Namespace Prefix: | sgrp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The annual medical benefits to be paid per year under the five year period agreement. + References No definition available. + Details
Name: | sgrp_FiveYearPeriodAgreementAnnualMedicalBenefits
Namespace Prefix: | sgrp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of regular fees per year to be paid under five year period agreement. + References No definition available. + Details
Name: | sgrp_FiveYearPeriodAgreementAnnualRegularFees
Namespace Prefix: | sgrp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of supplemental fees to be paid per year under five year period agreement. + References No definition available. + Details
Name: | sgrp_FiveYearPeriodAgreementAnnualSupplementalFees
Namespace Prefix: | sgrp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The total compensation to be paid under the five year period agreement. + References No definition available. + Details
Name: | sgrp_FiveYearPeriodAgreementTotalCompensation
Namespace Prefix: | sgrp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of retirement compensation under the five year period agreement. + References No definition available. + Details
Name: | sgrp_FiveYerPeriodAgreementRetirementCompensation
Namespace Prefix: | sgrp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of ownership by a related person in a related entity. + References No definition available. + Details
Name: | sgrp_RelatedPartyOwnershipPercentage
Namespace Prefix: | sgrp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=sgrp_WilliamBartelsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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