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Note 3 - Debt (Details Textual) $ in Millions | Apr. 18, 2024 USD ($) | Feb. 01, 2023 USD ($) | Sep. 30, 2025 USD ($) | Feb. 01, 2023 CAD ($) | Jul. 01, 2022 USD ($)
--- | --- | --- | --- | --- | ---
Resource Plus, Inc [Member] |  |  |  |  |
Payments to Acquire Interest in Joint Venture | $ 3,000,000 |  |  |  |
Long-Term Debt, Gross |  |  | $ 1,600,000 |  |
Revolving Credit Facility [Member] | North Mill, LLC [Member] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 9.15% |  |
Long-Term Debt |  |  | $ 23,800,000 |  |
Loans Payable, Current |  |  | 23,000,000 |  |
Revolving Credit Facility [Member] | North Mill, LLC [Member] | SPAR Marketing Force [Member] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 28,000,000 |  |  |
Debt Instrument, Covenant, Unbilled Cap |  | $ 7,000,000 |  |  | $ 6,500,000
Revolving Credit Facility [Member] | North Mill, LLC [Member] | SPAR Canada Company [Member] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 2 |
Long-Term Debt |  |  | $ 800,000 |  |
NM Note [Member] | North Mill, LLC [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.90% |  |  |
NM Note [Member] | North Mill, LLC [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 6.75% |  |  |
NM Notes Commencing on 10 October 2022 [Member] | North Mill, LLC [Member] |  |  |  |  |
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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