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Note 6 - Related-party Transactions (Details Textual) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 18, 2020 USD ($) | Nov. 30, 2020 BRL (R$) | Sep. 30, 2021 USD ($) | Sep. 30, 2021 AUD ($) | Dec. 31, 2020 USD ($)
SPAR BSMT Joint Venture [Member] |  |  |  |  |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage |  |  | 51.00% | 51.00% |
NMS [Member] | Minimum [Member] |  |  |  |  |
Percent of Reimbursement |  |  | 4.00% | 4.00% |
NMS [Member] | Maximum [Member] |  |  |  |  |
Percent of Reimbursement |  |  | 10.00% | 10.00% |
JKC [Member] | SPAR BSMT Joint Venture [Member] |  |  |  |  |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage |  |  | 39.00% | 39.00% |
EILLC [Member] | SPAR BSMT Joint Venture [Member] |  |  |  |  |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage |  |  | 10.00% | 10.00% |
NMS [Member] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 49.00% | 49.00% |
NSRS [Member] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 100.00% | 100.00% |
Resource Plus, Inc [Member] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 49.00% | 49.00% |
RJ Holdings [Member] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 50.00% | 50.00% |
Meridian [Member] |  |  |  |  |
Majority Interest Ownership Percentage By Parent |  |  | 51.00% | 51.00% |
Meridian [Member] | FRIEDSHELF 401 Proprietary Limited [Member] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 23.00% | 23.00% |
Meridian [Member] | Lindicom Proprietary Limited [Member] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 26.00% | 26.00% |
SPAR Todopromo [Member] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 49.00% | 49.00% |
NMS [Member] |  |  |  |  |
Majority Interest Ownership Percentage By Parent |  |  | 51.00% | 51.00% |
Operating Lease, Expense Per Month |  |  | $ 2,000 |  |
Resource Plus, Inc [Member] |  |  |  |  |
Majority Interest Ownership Percentage By Parent |  |  | 51.00% | 51.00% |
SPAR Todopromo [Member] |  |  |  |  |
Majority Interest Ownership Percentage By Parent |  |  | 51.00% | 51.00% |
Mr. Juan F. Medina Domenzain [Member] | CON [Member] |  |  |  |  |
Related Party Ownership Percentage |  |  | 90.00% | 90.00% |
Mr. Juan F. Medina Domenzain [Member] | SPAR Todopromo [Member] |  |  |  |  |
Operating Lease, Expense Per Month |  |  | $ 4,000 | $ 85,000 |
Peter Brown [Member] | SPAR BSMT Joint Venture [Member] | Initiation Fee for Acquisition Strategy Services [Member] |  |  |  |  |
Related Party Transaction, Amounts of Transaction | R$ |  | R$ 30,000 |  |  |
Peter Brown [Member] | SPAR BSMT Joint Venture [Member] | Monthly Fee for Acquisition Strategy Services [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
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

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