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Note 8 - Related Party Transactions (Details Textual) $ / shares in Units, R$ in Millions |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 19, 2024 USD ($) | Sep. 25, 2024 USD ($) | May 03, 2024 $ / shares shares | Apr. 30, 2024 shares | Apr. 29, 2024 USD ($) $ / shares | Apr. 29, 2024 ZAR (R) | Feb. 23, 2024 USD ($) | Feb. 07, 2024 ZAR (R) | Aug. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Mar. 26, 2024 USD ($) | Mar. 26, 2024 BRL (R$)
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |  |  | $ (0) |  | $ (960,000) |  |  | $ (0) | $ 4,786,000 |  |  |
SGRP Meridian [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration | R |  |  |  |  |  |  |  | R 180,700,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sales of Business, Affiliate and Productive Assets |  |  |  |  | $ 7,700,000 | R 144,560,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,200,000 |  |  |  |  |
SGRP Meridian [Member] | Other Receivable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Receivable From Sale Consideration |  |  |  |  | $ 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Brazil Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,800,000 | R$ 58.9
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |  |  | (0) |  |  | $ (1,200,000) |  | (1,188,000) |  |  |  |
SPAR Japan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |  |  |  |  | (700,000) |  |  |  |  |  |  |
Indian Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |  |  |  |  | (1,400,000) |  |  |  |  |  |  |
Mexican Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration | $ 417,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |  |  |  | $ (1,100,000) |  |  |  |  |  |  |  |
SPAR BSMT [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Parent |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.00% |  |  |  |  |
Meridian [Member] | FRIEDSHELF 401 Proprietary Limited [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Noncontrolling Owner |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |  |  |  |
SPAR Group [Member] | SGRP Meridian [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent Of Ownership Interest In Subsidiary Sold By Company |  |  |  |  |  |  |  | 51.00% |  |  |  |  |  |  |  |  |  |  |
SPAR Group [Member] | SPAR China [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent Of Ownership Interest In Subsidiary Sold By Company |  |  |  |  |  |  | 51.00% |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,100,000) |  |  |  |  |  |
Proceeds From Sale of Ownership Interest |  |  |  |  |  |  | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |
SPAR Group [Member] | SPAR Japan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent Of Ownership Interest In Subsidiary Sold By Company |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
SPAR Group [Member] | Indian Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent Of Ownership Interest In Subsidiary Sold By Company |  | 51.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SPAR Group [Member] | Mexican Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent Of Ownership Interest In Subsidiary Sold By Company | 51.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SPAR Marketing Force [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.00% | 51.00%
William Bartels [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability, Pension and Other Postretirement and Postemployment Benefits, Current |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  | 0 |  |  |  |
William Bartels [Member] | The 2024 Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) | shares |  |  | 1,000,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Price (in dollars per share) | $ / shares |  |  | $ 1.8 |  | $ 1.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium Adjustments [Member] | William Bartels [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 |  |
Remaining Premium Adjustments [Member] | William Bartels [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,100,000 |  |
Service Fees [Member] | WB Marketing, Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  |  |  |  |  | $ 51,130 |  | $ 242,060 |  |  | $ 14,000 | $ 101,000 |  |  |

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