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Note 3 - Debt (Details Textual) ر.س in Millions, ¥ in Millions, $ in Millions, $ in Millions | Oct. 10, 2023 USD ($) | Feb. 01, 2023 USD ($) | Jul. 01, 2022 USD ($) | Mar. 22, 2021 USD ($) | Mar. 31, 2023 USD ($) | Feb. 01, 2023 CAD ($) | Dec. 31, 2022 SAR (ر.س) | Jul. 01, 2022 CAD ($) | Mar. 31, 2022 SAR (ر.س) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥) | Jan. 09, 2018 USD ($) | Oct. 31, 2017 AUD ($)
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Resource Plus Acquisition Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 1.85% |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  | $ 2,300,000 |
Notes Payable |  |  |  |  | $ 700,000 |  |  |  |  |  |  |  |
Industrial Bank [Member] | SPAR China [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 4.00% |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  | $ 400,000 |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | ¥ |  |  |  |  |  |  |  |  |  |  | ¥ 3 |  |
Industrial Bank and Commercial Bank of China [Member] | SPAR China [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 4.20% |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | ¥ |  |  |  |  |  |  |  |  |  | ¥ 2 |  |  |
Investec Bank Ltd. [Member] | SGRP Meridian [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 11.30% |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  | $ 3,400,000 |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | ر.س |  |  |  |  |  |  | ر.س 30 |  | ر.س 60 |  |  |  |
Revolving Credit Facility [Member] | North Mill, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Fee Amount |  | $ 28,000 |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  | $ 14,100,000 |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | SPAR Marketing Force [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 28,000,000.0 | $ 17,500,000 |  |  | $ 2.0 |  |  |  |  |  |  |
Borrowing Base Availability for Billed Receivables, Percentage |  |  | 90.00% | 85.00% |  |  |  |  |  |  |  |  |
Borrowing Base Availability for Unbilled Receivables, Percentage |  |  | 80.00% | 70.00% |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Unbilled Cap |  | $ 7,000,000.0 | $ 6,500,000 | $ 5,500,000 |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | SPAR Canada Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  | $ 1.5 |  |  |  |  |
Revolving Credit Facility [Member] | National Australia Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit, Current |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.8
Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability |  |  |  |  |  |  |  |  |  |  |  |  | 80.00%
Line of Credit Facility, Interest Rate at Period End |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
Long-Term Line of Credit, Total |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |
NM Note [Member] | North Mill, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 9.90% |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  | $ 14,800,000 |  |  |  |  |  |  |  |
NM Note [Member] | North Mill, LLC [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 6.75% |  |  |  |  |  |  |  |  |  |  |
NM Note [Member] | North Mill, LLC [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.90% |  |  |  |  |  |  |  |  |  |  |
NM Note [Member] | North Mill, LLC [Member] | SPAR Canada Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  | $ 700,000 |  |  |  |  |  |  |  |
NM Notes Commencing on 10 October 2022 [Member] | North Mill, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Fee Amount |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Facility Fee for Any Advances Other Than Under Revolving Credit Faculty, Percentage |  | 0.80% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Fee for Each Incremental 1 Million Increase in Loan Balance in Excess of $21 Million |  | $ 15,000 |  |  |  |  |  |  |  |  |  |  |
NM Notes Commencing on 10 October 2022 [Member] | North Mill, LLC [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Fee Amount | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Facility Fee for Any Advances Other Than Under Revolving Credit Faculty, Percentage | 0.80% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Fee for Each Incremental 1 Million Increase in Loan Balance in Excess of $21 Million | $ 15,000 |  |  |  |  |  |  |  |  |  |  |  |

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