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Note 5 - Related-party Transactions (Details Textual) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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 |  |  |  |  |

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