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Note 10 - Related Party Transactions (Details Textual)					1 Months Ended	7 Months Ended	9 Months Ended		12 Months Ended	67 Months Ended
Note 10 - Related Party Transactions (Details Textual)	Aug. 06, 2019 USD ($)	Sep. 19, 2018 USD ($)	Sep. 18, 2018 USD ($)	Dec. 01, 2014 USD ($)	Nov. 30, 2017 USD ($)	Jul. 31, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2019 USD ($)	Aug. 01, 2018 USD ($)	Dec. 31, 2018 USD ($)
Insurance Premium Refund Receivable									$ 150,000
Affinity Returns from SAS and SBS [Member]
Estimated Litigation Liability											$ 900,000
Affinity Cash Collateral loan to SBS in the SBS Chapter 11 Proceeding [Member]
Loss Contingency, Damages Sought, Value									$ 375,000
SPAR BSMT Joint Venture [Member]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage									51.00%
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 (Year)									4 years
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%
NMS [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners									49.00%
NSRS [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners									100.00%
Resource Plus, Inc [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners									49.00%
RJ Holdings [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners									50.00%
Meridian [Member]
Majority Interest Ownership Percentage By Parent									51.00%
Meridian [Member] \| FRIEDSHELF 401 Proprietary Limited [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners									23.00%
Meridian [Member] \| Lindicom Proprietary Limited [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners									26.00%
SPAR Todopromo [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners									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	$ 62,534
Settlement and Other Charges							$ 174,097
Settlement Agreement, Amount Awarded, Monthly Payment									$ 7,254
SBS [Member]
Number of Merchandising Specialists								4,500
Percent Of Service Provided By Related Party								43.00%
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] \| Domestic Merchandising Specialists Field Force [Member]
Payments for Related Party Services								$ 13,300,000
SBS [Member] \| Cost Plus Fees [Member]
Related Party Transaction, Rate				2.96%
SAS [Member]
Number of National, Regional, and District Administrators								2,018
Payments for Cash Collateral Deposits										965,000
SAS [Member] \| Post-termination Expenses [Member]
Loss Contingency, Estimate of Possible Loss							$ 200,000
SAS [Member] \| Domestic Field Management [Member]
Payments for Related Party Services						$ 2,700,000
SAS [Member] \| Advances for Affinity Insurance Plan [Member]
Related Party Transaction, Amounts of Transaction									$ 225,000
SPAR InfoTech, Inc. [Member] \| Alleged Lost Tax Benefits and Other Expenses [Member]
Loss Contingency, Damages Sought, Value		$ 190,000	$ 190,000
SPAR InfoTech, Inc. [Member] \| Allegedly Owed Programming Services [Member]
Loss Contingency, Damages Sought, Value		$ 900,000	$ 900,000
NMS [Member]
Majority Interest Ownership Percentage By Parent									51.00%
Operating Lease, Expense Per Month									$ 2,000
Resource Plus, Inc [Member]
Majority Interest Ownership Percentage By Parent									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%
Mr. Juan F. Medina Domenzain [Member] \| CON [Member]
Related Party Ownership Percentage									90.00%
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
SAS, SBS, and SMF [Member] \| Affinity Insurance [Member]
Estimated Reimbursement on Advances										$ 675,000
Robert G. Brown and William H. Bartels [Member]
Related Party Ownership Percentage					33.00%
SBS And SAS [Member]
Reserve for Related-party Receivables, Amount Recorded During Period					$ 675,000