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Note 5 - Related-Party Transactions (Details Textual)						1 Months Ended	3 Months Ended		7 Months Ended	67 Months Ended
Note 5 - Related-Party Transactions (Details Textual)	Mar. 18, 2019 USD ($)	Feb. 12, 2019 USD ($)	Sep. 18, 2018 USD ($)	Sep. 08, 2016	Dec. 01, 2014 USD ($)	Nov. 30, 2017 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Jul. 31, 2018 USD ($)	Aug. 01, 2018 USD ($)	Jan. 10, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 07, 2018 USD ($)
Insurance Premium Refund Receivable							$ 150,000
Increase (Decrease) in Accounts Receivable							1,236,000	$ 7,108,000
Affinity Returns from SAS and SBS [Member]
Estimated Litigation Liability												$ 901,000
Affinity Cash Collateral loan to SBS in the SBS Chapter 11 Proceeding [Member]
Loss Contingency, Damages Sought, Value							$ 375,000
Reimbursement for SMF's funding of the Affinity Security Deposits [Member]
Loss Contingency, Damages Sought, Value	$ 378,838
Reimbursement for SMF's Funding of the Field Payment Checks [Member]
Loss Contingency, Damages Sought, Value	12,963
SBS Clothier Litigation [Member]
Loss Contingency, Estimate of Possible Loss													$ 1,300,000
Loss Contingency, Damages Sought, Value	$ 1,839,459
SGRP Holdings [Member]
Business Acquisition, Percentage of Voting Interests Acquired				100.00%
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							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%
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%
FRIEDSHELF 401 Proprietary Limited [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners							23.00%
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%
SBS [Member]
Number of Merchandising Specialists							3,800
Withheld Final Mark-up Compensation Due to Related Party					$ 435,000
Additional Funding for Field Specialist Payments					13,000
Estimated Additional Field Specialist Payments					$ 120,000
Related Party Transaction, Reimbursement of Legal Expenses from Transaction with Related Party							$ 60,000		$ 50,000
Payments for Cash Collateral Deposits, Allocated to Related Party										$ 379,000
SBS [Member] \| Affinity Cash Collateral loan to SBS in the SBS Chapter 11 Proceeding [Member]
Notes Receivable, Related Parties											$ 300,000
Increase (Decrease) in Accounts Receivable		$ 300,000
SBS [Member] \| Post-termination Expenses [Member]
Loss Contingency, Estimate of Possible Loss							124,000
SBS [Member] \| Domestic Merchandising Specialists Field Force [Member]
Payments for Related Party Services							$ 6,800,000
Percent Of Service Provided By Related Party							52.00%
SBS [Member] \| Cost Plus Fees [Member]
Related Party Transaction, Rate					2.96%
SAS [Member]
Number of National, Regional, and District Administrators								57
Payments for Cash Collateral Deposits										965,000
SAS [Member] \| Post-termination Expenses [Member]
Loss Contingency, Estimate of Possible Loss							$ 108,000
SAS [Member] \| Domestic Field Management [Member]
Payments for Related Party Services								$ 1,100,000
Percent Of Service Provided By Related Party								91.00%
SAS [Member] \| Advances for Affinity Insurance Plan [Member]
Related Party Transaction, Amounts of Transaction							$ 226,000
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 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						59.00%
SBS And SAS [Member]
Reserve for Related-party Receivables, Amount Recorded During Period						$ 675,000