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Note 5 - Related-party Transactions (Details Textual)											1 Months Ended				3 Months Ended	6 Months Ended	12 Months Ended
Note 5 - Related-party Transactions (Details Textual)	Mar. 17, 2020 USD ($)	Mar. 06, 2020 USD ($)	Jan. 18, 2020 USD ($)	Jan. 01, 2020 USD ($)	Oct. 30, 2019 USD ($)	Oct. 08, 2019 USD ($)	Jul. 26, 2019 USD ($)	Mar. 18, 2019 USD ($)	Sep. 19, 2018 USD ($)	Sep. 08, 2016	Mar. 31, 2020 USD ($)	Jan. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Nov. 30, 2019 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jul. 08, 2020 USD ($)	May 07, 2018 USD ($)
NMS [Member]
Percent of Reimbursement																1.00%
Merhold Property Trust [Member]
Number Of Vehicles Subleased																32
Number Of Vehicles Leased																173
Lessee, Operating Lease, Term of Contract (Year)																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%
SMF [Member] \| SAS [Member]
Due from Related Parties, Total																$ 226,000
Security Deposit																$ 675,000
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%
Settlement Agreement with SBS [Member]
Loss Contingency, Damages Sought, Value				$ 2,200,000
Settlement Agreement, Amount Awarded, Before Discount							$ 0
Settlement and Other Charges				174,097													$ 174,097
Settlement Agreement, Amount Awarded, Monthly Payment				7,254
Settlement, Periodic Payment				$ 7,254												$ 43,524
Robert G. Brown Demand for Payment [Member] \| Robert G. Brown [Member]
Loss Contingency, Damages Sought, Value	$ 1,300,000														$ 3,000,000
SPAR InfoTech, Inc. [Member] \| Alleged Lost Tax Benefits and Other Expenses [Member]
Loss Contingency, Damages Sought, Value									$ 190,000
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, Damages Sought, Value								$ 1,839,459
Settlement and Other Charges																		$ 1,300,000
Loss Contingency, Damages Number of Equal Annual Installments																	4
SAS [Member]
Reimbursement Expenses Offered																				$ 237,500
Due from Related Parties, Total																				226,000
Payment for Reimbursement Expenses Net Of Amounts Owed																				$ 11,500
SAS [Member] \| Advances for Affinity Insurance Plan [Member]
Related Party Transaction, Amounts of Transaction																921,000
SAS [Member] \| Return of Security Advances and Preimum Advances [Member]
Due from Related Parties, Total																			$ 901,000
SAS [Member] \| Premium Adjustments [Member]
Related Party Transaction, Amounts of Transaction																220,558
SAS [Member] \| Remaining Premium Adjustments [Member]
Related Party Transaction, Amounts of Transaction																$ 1,102,790
SPAR InfoTech, Inc. [Member] \| Alleged Lost Tax Benefits and Other Expenses [Member]
Loss Contingency, Damages Sought, Value									190,000
Related-party Expenses Allowed by the Audit Committee									50,000
Related-party Expenses Disallowed By the Audit Committee									150,000
SPAR InfoTech, Inc. [Member] \| Allegedly Owed Programming Services [Member]
Loss Contingency, Damages Sought, Value									900,000
SPAR InfoTech, Inc. [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							$ 50,000	$ 75,000	$ 75,000
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%
Robert G. Brown [Member]
Related-party Expenses Allowed by the Audit Committee									50,000
Related-party Expenses Disallowed By the Audit Committee									$ 150,000
Robert G. Brown [Member] \| Robert G. Brown Demand for Payment [Member]
Loss Contingency, Damages Sought, Value		$ 1,707,374
Loss Contingency, Yearly Damages Sought, Value											$ 500,000
Meridian [Member]
Majority Interest Ownership Percentage By Parent																51.00%
Mr. Mason [Member] \| Merhold Property Trust [Member]
Related Party Ownership Percentage																1.00%
Mr. Mason and Mr. Bristow [Member] \| Merhold Cape Property Trust [Member]
Related Party Ownership Percentage																1.00%
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%
William Bartels [Member]
Five Yer Period Agreement, Retirement Compensation			$ 100,000
Five Year Period Agreement, Annual Regular Fees			55,000
Five Year Period Agreement, Annual Supplemental Fees			50,000
Five Year Period Agreement, Annual Medical Benefits			$ 15,588
William Bartels [Member] \| SPAR Group [Member]
Pension and Other Postretirement Benefits Cost (Reversal of Cost), Total																$ 700,000
Percentage of Stockholders' Shares																25.10%