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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

X

- Definition

The annual medical benefits to be paid per year under the five year period agreement.

+ References

No definition available.

+ Details

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- Definition

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+ References

No definition available.

+ Details

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- Definition

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+ References

No definition available.

+ Details

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- Definition

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+ References

No definition available.

+ Details

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- Definition

The parent entity's majority interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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- Definition

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+ References

No definition available.

+ Details

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X

- Definition

Represents the percentage of reimbursement based on total cost.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of ownership by a related person in a related entity.

+ References

No definition available.

+ Details

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X

- Definition

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+ References

No definition available.

+ Details

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- Definition

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+ References

No definition available.

+ Details

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- Definition

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+ References

No definition available.

+ Details

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- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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