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Note 5 - Related-party Transactions (Details Textual)		1 Months Ended		3 Months Ended	12 Months Ended
Note 5 - Related-party Transactions (Details Textual)	Jan. 18, 2020 USD ($)	Nov. 30, 2020 BRL (R$)	May 31, 2020 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	May 26, 2021	Mar. 25, 2021 USD ($)	Jul. 08, 2020 USD ($)	Dec. 31, 2018 USD ($)	Jul. 31, 2018 USD ($)
SPAR BSMT Joint Venture [Member]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage				51.00%
William Bartels [Member] \| Loans Payable [Member]
Debt Instrument, Face Amount							$ 100,000
Debt Instrument, Interest Rate, Stated Percentage						6.00%	2.00%
Security Advances [Member]
Reserve for Related-party Receivables									$ 901,000
NMS [Member] \| Minimum [Member]
Percent of Reimbursement				4.00%
NMS [Member] \| Maximum [Member]
Percent of Reimbursement				10.00%
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%
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%
Robert G. Brown and William H. Bartels [Member] \| SPAR Group [Member]
Percentage of Stockholders' Shares				53.50%
SAS [Member] \| Return of Security Advances and Preimum Advances [Member]
Due from Related Parties, Total								$ 901,000
SAS [Member] \| Security Advances [Member]
Due from Related Parties, Total								675,000
SAS [Member] \| Premium Advances [Member]
Due from Related Parties, Total								226,000
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
SAS [Member] \| SMF [Member]
Security Deposit										$ 675,000
Due from Related Parties, Total								$ 226,000		226,000
Affinity Insurance Company, Ltd. [Member]
Related Party Deposit Liabilities										$ 965,000
Affinity Insurance Company, Ltd. [Member] \| SMF [Member]
Proceeds from Security Deposit Refund					426,795
Affinity Insurance Company, Ltd. [Member] \| SMF [Member] \| Monies Advanced By SMF to SAS for Quarterly Premium Installments [Member]
Related Party Transaction, Amount Refunded			$ 94,414
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%
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%
Peter Brown [Member] \| Initiation Fee for Acquisition Strategy Services [Member] \| SPAR BSMT Joint Venture [Member]
Related Party Transaction, Amounts of Transaction \| R$		R$ 30,000
Peter Brown [Member] \| Monthly Fee for Acquisition Strategy Services [Member] \| SPAR BSMT Joint Venture [Member]
Related Party Transaction, Amounts of Transaction \| R$		R$ 15,000
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