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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 |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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 |  |  |  |  |  |

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