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

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Number of available field merchandising specialists.

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Note 5 - Related-party Transactions (Details Textual)							1 Months Ended				3 Months Ended		6 Months Ended	7 Months Ended	9 Months Ended		67 Months Ended
Note 5 - Related-party Transactions (Details Textual)	Oct. 30, 2019 USD ($)	Oct. 08, 2019 USD ($)	Jul. 26, 2019 USD ($)	Sep. 19, 2018 USD ($)	Sep. 08, 2016	Dec. 01, 2014 USD ($)	Jan. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Nov. 30, 2019 USD ($)	Nov. 30, 2017 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jul. 31, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Aug. 01, 2018 USD ($)	Dec. 31, 2018 USD ($)
Settlement and Other Charges																$ 1,975,000
Insurance Premium Refund Receivable											$ 150,000				$ 150,000
Affinity Returns from SAS and SBS [Member]
Estimated Litigation Liability																		$ 901,000
NMS [Member]
Percent of Reimbursement															1.00%
Merhold Property Trust [Member]
Number Of Vehicles Subleased															20
Number Of Vehicles Leased															172
Lessee, Operating Lease, Term of Contract											4 years				4 years
CON [Member] \| Mr. Juan F. Medina Domenzain [Member]
Related Party Ownership Percentage															90.00%
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%
EILLC [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners											10.00%				10.00%
NMS [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners											49.00%				49.00%
NSRS [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners											100.00%				100.00%
Resource Plus, Inc [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners											49.00%				49.00%
RJ Holdings [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners											50.00%				50.00%
FRIEDSHELF 401 Proprietary Limited [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners											23.00%				23.00%
Lindicom Proprietary Limited [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners											26.00%				26.00%
SPAR Todopromo [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners											49.00%				49.00%
Settlement Agreement with SBS [Member]
Settlement Agreement, Amount Awarded, Before Discount			$ 2,231,260
Settlement Agreement, Amount Awarded, After Discount			$ 111,563
Settlement Agreement, Number of Monthly Installments			24
Settlement Agreement, Amount Awarded, After Discount, Monthly Amount			$ 61,370
Settlement and Other Charges															$ 172,933
SBS [Member]
Number of Merchandising Specialists															4,500
Withheld Final Mark-up Compensation Due to Related Party						$ 112,000
Additional Funding for Field Specialist Payments						$ 13,000
Payments for Cash Collateral Deposits, Allocated to Related Party																	$ 379,000
SBS [Member] \| Post-termination Expenses [Member]
Loss Contingency, Estimate of Possible Loss											$ 200,000				$ 200,000
SBS [Member] \| Domestic Merchandising Specialists Field Force [Member]
Payments for Related Party Services															13,300,000
Percent Of Service Provided By Related Party																43.00%
SBS [Member] \| Cost Plus Fees [Member]
Related Party Transaction, Rate						2.96%
SAS [Member]
Number of National, Regional, and District Administrators														57		57
Payments for Cash Collateral Deposits																	965,000
SAS [Member] \| Domestic Field Management [Member]
Payments for Related Party Services														$ 2,700,000		$ 2,700,000
Percent Of Service Provided By Related Party														91.00%		91.00%
Loss Contingency, Estimate of Possible Loss													$ 200,000
SAS [Member] \| Premium Adjustments [Member]
Related Party Transaction, Amounts of Transaction															215,000
SAS [Member] \| Remaining Premium Adjustments [Member]
Related Party Transaction, Amounts of Transaction															26,000
SAS [Member] \| Affinity Adjustments [Member]
Related Party Transaction, Amounts of Transaction															200,000
SAS [Member] \| Advances for Affinity Insurance Plan [Member]
Related Party Transaction, Amounts of Transaction													$ 226,000		$ 226,000
SPAR InfoTech, Inc. [Member] \| Infotech Action and the Romanian Claim [Member] \| Forecast [Member]
Loss Contingency Accrual, Payments							$ 50,000	$ 75,000	$ 75,000
SPAR InfoTech, Inc. [Member] \| Subsequent Event [Member] \| Infotech Action and the Romanian Claim [Member]
Settlement, Amount Offered		$ 225,000
Settlement, Amount Accepted		$ 275,000
Loss Contingency, Damages Number of Equal Annual Installments		4
Loss Contingency Accrual, Payments	$ 75,000
SPAR InfoTech, Inc. [Member] \| Alleged Lost Tax Benefits and Other Expenses [Member]
Loss Contingency, Damages Sought, Value				$ 190,000
SPAR InfoTech, Inc. [Member] \| Allegedly Owed Programming Services [Member]
Loss Contingency, Damages Sought, Value				900,000
NMS [Member]
Majority Interest Ownership Percentage By Parent											51.00%				51.00%
Operating Lease, Expense Per Month															$ 2,000
Resource Plus, Inc [Member]
Majority Interest Ownership Percentage By Parent											51.00%				51.00%
Robert G. Brown [Member]
Related-party Expenses Allowed by the Audit Committee				50,000
Related-party Expenses Disallowed By the Audit Committee				$ 150,000
Meridian [Member]
Majority Interest Ownership Percentage By Parent											51.00%				51.00%
Mr. Mason [Member] \| Merhold Property Trust [Member]
Related Party Ownership Percentage															50.00%
Mr. Mason and Mr. Bristow [Member] \| Merhold Cape Property Trust [Member]
Related Party Ownership Percentage															50.00%
SPAR Todopromo [Member]
Majority Interest Ownership Percentage By Parent											51.00%				51.00%
SPAR Marketing Force [Member]
Payments for Cash Collateral Deposits, Allocated to Related Party																	296,000
All Others [Member]
Payments for Cash Collateral Deposits, Allocated to Related Party																	$ 290,000
Robert G. Brown and William H. Bartels [Member]
Related Party Ownership Percentage										180000.00%
SBS And SAS [Member]
Reserve for Related-party Receivables, Amount Recorded During Period										$ 516,000
Reserve for Related-party Receivables, Amount Recorded During Period, Cash Collateral										290,000
Reserve for Related-party Receivables, Amount Recorded During Period, Insurance Premium Advance										$ 226,000