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Note 10 - Related Party Transactions (Details Textual) |  |  |  |  | 1 Months Ended | 5 Months Ended | 7 Months Ended | 11 Months Ended | 12 Months Ended | 67 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 18, 2018 USD ($) | Sep. 08, 2016 | Jun. 01, 2016 | Dec. 01, 2014 USD ($) | Nov. 30, 2017 USD ($) | May 31, 2016 | Jul. 31, 2018 USD ($) | Jul. 27, 2018 USD ($) | Nov. 23, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Aug. 01, 2018 USD ($)
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  |  |  |  |  |  |  | $ 20,090,000 | $ 31,762,000 |
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 |  |
SGRP Holdings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 100.00% |  |  |  |  |  |  |  |  |  |
Merhold Property Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |
Number Of Vehicles Subleased |  |  |  |  |  |  |  |  |  | 20 |  |
Number Of Vehicles Leased |  |  |  |  |  |  |  |  |  | 172 |  |
Lessee, Operating Lease, Term of Contract |  |  |  |  |  |  |  |  |  | 4 years |  |
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% |  |  |  |  |  |  |  |  |  |
NMS [Member] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  |  |  |  | 49.00% |  |
Resource Plus, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  |  |  |  | 49.00% |  |
Meridian [Member] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  |  |  |  | 49.00% |  |
SPAR Todopromo [Member] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  |  |  |  | 49.00% |  |
SBS [Member] |  |  |  |  |  |  |  |  |  |  |  |
Number of Merchandising Specialists |  |  |  |  |  |  |  | 3,800 |  |  | 3,800 |
Withheld Final Mark-up Compensation Due to Related Party |  |  |  | $ 125,000 |  |  |  |  |  |  |  |
Additional Funding for Field Specialist Payments |  |  |  | 12,000 |  |  |  |  |  |  |  |
Estimated Additional Field Specialist Payments |  |  |  | $ 120,000 |  |  |  |  |  |  |  |
Related Party Transaction, Reimbursement of Legal Expenses from Transaction with Related Party |  |  |  |  |  |  | $ 260,000,000,000 |  | $ 50,000 |  | $ 260,000 |
Payments for Cash Collateral Deposits, Allocated to Related Party |  |  |  |  |  |  |  |  |  |  |  | $ 379,000
SBS [Member] | Post-termination Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  |  |  |  |  |  |  | $ 120,000 |  |
SBS [Member] | Domestic Merchandising Specialists Field Force [Member] |  |  |  |  |  |  |  |  |  |  |  |
Payments for Related Party Services |  |  |  |  |  |  |  | $ 15,400,000 |  |  | $ 25,900,000 |
Percent Of Service Provided By Related Party |  |  |  |  |  |  |  | 27.00% |  |  | 77.00% |
SBS [Member] | Domestic Field Management [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  |  |  |  |  | $ 18,100,000 |  |  | $ 30,100,000 |
SBS [Member] | Cost Plus Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Rate |  |  | 2.00% | 2.96% |  | 4.00% |  |  |  |  |  |
SAS [Member] |  |  |  |  |  |  |  |  |  |  |  |
Number of National, Regional, and District Administrators |  |  |  |  |  |  | 52 |  |  |  | 52 |
Payments for Cash Collateral Deposits |  |  |  |  |  |  |  |  |  |  |  | 965,000
SAS [Member] | Post-termination Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  |  |  |  |  |  |  | 76,000 |  |
SAS [Member] | Domestic Field Management [Member] |  |  |  |  |  |  |  |  |  |  |  |
Payments for Related Party Services |  |  |  |  |  |  | $ 2,700,000 |  |  |  | $ 4,200,000 |
Percent Of Service Provided By Related Party |  |  |  |  |  |  | 53.00% |  |  |  | 91.00% |
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  |  |  |  |  | $ 2,700,000 |  |  | $ 4,200,000 |
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 |  |  |  |  |  |  |  |  |  |  |
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% |  |
Resource Plus, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Majority Interest Ownership Percentage By Parent |  |  |  |  |  |  |  |  |  | 51.00% |  |
Meridian [Member] |  |  |  |  |  |  |  |  |  |  |  |
Majority Interest Ownership Percentage By Parent |  |  |  |  |  |  |  |  |  | 51.00% |  |
Mr. Mason [Member] | Merhold Property Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Ownership Percentage |  |  |  |  |  |  |  |  |  | 50.00% |  |
Mr. Mason [Member] | Merhold Holding Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Ownership Percentage |  |  |  |  |  |  |  |  |  | 46.70% |  |
Mr. Mason and Mr. Bristow [Member] | Merhold Cape Property Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Ownership Percentage |  |  |  |  |  |  |  |  |  | 50.00% |  |
Mr. Bristow [Member] | Merhold Holding Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Ownership Percentage |  |  |  |  |  |  |  |  |  | 20.00% |  |
Mr. Wingfield [Member] | Merhold Holding Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Ownership Percentage |  |  |  |  |  |  |  |  |  | 33.30% |  |
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 |  |  |  |  | 59.00% |  |  |  |  |  |  |
SBS And SAS [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reserve for Related-party Receivables, Amount Recorded During Period |  |  |  |  | $ 675,000 |  |  |  |  |  |  |

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