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Note 3 - Debt (Details Textual) ¥ in Millions, R in Millions, $ in Millions | Oct. 10, 2023 USD ($) | Feb. 01, 2023 USD ($) | Jul. 01, 2022 USD ($) | Mar. 22, 2021 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2024 ZAR (R) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Feb. 01, 2023 CAD ($) | Jul. 01, 2022 CAD ($) | Dec. 31, 2021 CNY (¥)
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Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |  | Prime Rate [Member] |  |  |  |  |  |  |  |  |
Long-Term Debt, Current Maturities |  |  |  |  | $ 15,159,000 |  | $ 17,530,000 |  |  |  |
Industrial Bank [Member] | SPAR China [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 3.56% | 3.56% |  |  |  |  |
Debt Instrument, Face Amount | ¥ |  |  |  |  |  |  |  | ¥ 2 |  |  |
Long-Term Debt, Current Maturities |  |  |  |  | $ 300,000 |  |  |  |  |  |
Industrial Bank and Commercial Bank of China [Member] | SPAR China [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 4.00% | 4.00% |  |  |  |  |
Debt Instrument, Face Amount | ¥ |  |  |  |  |  |  |  |  |  |  | ¥ 2
Long-Term Debt, Current Maturities |  |  |  |  | $ 300,000 |  |  |  |  |  |
Investec Bank Ltd. [Member] | SGRP Meridian [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 11.75% | 11.75% |  |  |  |  |
Debt Instrument, Face Amount | R |  |  |  |  |  | R 105 |  |  |  |  |
Revolving Credit Facility [Member] | North Mill, LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Related Commitment Fees and Debt Issuance Costs |  | $ 28,000 |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | SPAR Marketing Force [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 28,000,000 | $ 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 | $ 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 |
NM Note [Member] | North Mill, LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.90% |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 10.32% | 10.32% |  |  |  |  |
Long-Term Debt |  |  |  |  | $ 14,600,000 |  |  |  |  |  |
Loans Payable, Current |  |  |  |  | 13,700,000 |  |  |  |  |  |
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] | SPAR Canada Company [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt |  |  |  |  | $ 900,000 |  |  |  |  |  |
NM Notes Commencing on 10 October 2022 [Member] | North Mill, LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Fee Amount | $ 200,000 | $ 100,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Facility Fee for Any Advances Other Than Under Revolving Credit Faculty, Percentage | 0.80% | 0.80% |  |  |  |  |  |  |  |  |
Debt Instrument, Fee for Each Incremental 1 Million Increase in Loan Balance in Excess of $21 Million | $ 15,000 | $ 15,000 |  |  |  |  |  |  |  |  |

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